There's close to no reason to use dark magic skill gear for death.

ItemSet 340525
(edit: but with taranus's cape)

For Augmenting Merlinic...

Do you use P stones until you get 35+ macc and 35 + MAB first and then use F stones to random good burst bonus?
Or do all stats randomize regardless of what stone you use?

all stats randomize regardless of stone you use

For some reason I"m having a hard time getting good damage and get lots of resists during MB. What should I do for my MB set?

main={ name="Lathi", augments={'MP+80','INT+20','"Mag.Atk.Bns."+20',}},
sub="Niobid Strap",
ammo="Pemphredo Tathlum",
head={ name="Merlinic Hood", augments={'"Mag.Atk.Bns."+30','Magic burst mdg.+10%','MND+7','Mag. Acc.+10',}},
body={ name="Merlinic Jubbah", augments={'Mag. Acc.+30','Magic burst mdg.+5%','"Mag.Atk.Bns."+14',}},
hands={ name="Amalric Gages", augments={'INT+10','Mag. Acc.+15','"Mag.Atk.Bns."+15',}},
legs={ name="Merlinic Shalwar", augments={'"Mag.Atk.Bns."+30','Magic burst mdg.+7%','MND+14','Mag. Acc.+3',}},
feet={ name="Merlinic Crackows", augments={'Mag. Acc.+27','Magic burst mdg.+5%','"Mag.Atk.Bns."+4',}},
neck="Mizu. Kubikazari",
waist="Refoccilation Stone",
left_ear="Barkaro. Earring",
right_ear="Friomisi Earring",
left_ring="Mujin Band",
right_ring="Shiva Ring +1",
back="Seshaw Cape",

I also have locus ring but i think that puts me over the 40% cap

Your gear isn't bad. There are a lot of factors, though. What mobs are you fighting? What are your job points like? Are you using Klimaform? Do you have GEOs using Languor/Focus as appropriate? How many BLMs are you nuking with? There's a 'feature' where if there are multiple bursts happening at the same time, subsequent bursts after the initial get a 60% damage penalty so that could also be a a reasoning by why you seem to be "resisted".

That said, you can do better with MACC on your legs and head, get your damn Hachirin-no-Obi, get the 20INT 20MACC/MDMG 10MAB ambuscade cape, and, of course, always blame your GEOs for not having Idris.

Also, to addendum to the comment above about stones, stats are 'random' but trend in different ways based on stone used. Really, if you're going for the a really great augment, any stone will work for MB sets.

More MATK on body/feet. Indi/Geo-Malaise too.

no

lol

everything mentioned prior is correct, but I would lean towards not being heavily Job Pointed. I see "new" blms with elite gear thinking they are going to come in and smash everything only to be disappointed. BLM is one of the few jobs that really gets its crushing power from Job Points.

Also this is gold

there is always sky elementals too. for example fire clusters stacks are 100k a pop on my server. spend one day a week binge watching your favorite shows/movies and nuke the hell out them. you will have a full auction house and steady income for the rest of the week while you do your other objectives.

Job Points. Got my BLM decked out before I got my 2100 JPs. My free nukes never went above 4k, my MBs never went over 15k.
Same gear, but with job points my first MB on Apex Crab ThunderVI did capped dmg with geo.

Without I do in the 50-60 range. Job points.
Also use crepe's if you're unlucky with macc on augments like I am.

Always use crepes 8)

BLM/RDM FC set, am I missing anything?

ItemSet 344416

Grio 4
Merlinic Head 15
Orun 5
Earring 2/1
Ring 2
Zendik 13
merlin hands 7
merlin feet 7 *EDIT* forgot base so 12
pyschloth lappa 7
witful 3
71% gear + 15% /rdm = 86% (80% cap?)

Quick Magic
Back 4
Ring 2
Ammo 2
Belt 3
11% total

I'm not a fan of quickmagic unless is raise, warp, etc. Taranus is inv+ for those not giving a damn about quickmagic.

I like quick magic, esp when you need a fast stoneskin, also lets me sometimes hit 3 spells on one SC, for death I have a specific FC set so it wont trigger on death, but for the rest I actually want to stack as much as possible.

Quick magic has it's place. but for me personally it needs to stay out of most of my sets. I read it as -midcast gear. and i'm fine with -80% as is.

That being said I know it's great for some choice spells, i'm simply too lazy and don't have the inv to care about making a whole set for it.

Am I missing something or why are people suddenly acting like you can't have midcast gear with quick magic procs?

I use the following as being overcapped doesn't help and your precast set may otherwise juke your HP/MP.

EDIT: misunderstood. I do it with death b/c if it fires off yeah my recast is 0, but for me to mykr or other Mp restore i wont hit the MB

I find quick cast for elemental magic incredibly annoying. If you go off before skillchain, you miss burst window and nerf all following nukes damage because you triggered resist wall... Also, why are you /rdm o.O

If you have proper fast cast sets in the first place you can cast your first nuke as the SC closer is going off and still double MB well within the window

No you will not~
I have done this myself and not noticed any increase in damage taken.

Setting a MB variable could help. So that if you have that variable on, not only do you nuke in your burst damage set, but you also precast in a FC set without any quickcast. That way, you can still get the benefit of it for things like SS, stun or even standard nukes.

New 4th slot for blm cape, will int beat macc/mdam for nukes? I know the value is probably less but int adds both right?

you get macc or mdam noth both*

I'm going INT+10

EDIT: scatch that, guess i'm adding 10 more accuracy to Blu cape.

Very delayed response, but this is wrong. The optimal double burst method is what Ramzus described. Start nuking as the closer closes (???). If quick cast procs you will still burst, and you will do more damage even if quick cast doesn't proc as the skillchain itself will cause the % damage reduction timer to start, so the delay will help.

I don't know - this has happened to me a couple of times on Plouton in vagary where I would start casting as soon as the SCH starts Alacrity -> casting his Skillchain closer, and quick magic has proced and had no magic burst, just a normal ThunderVI.

Its very easy to land double magic bursts with capped fast cast anyways. I can see quick magic's benefit on a second MB, but on the first its a determinant.

It's not a detriment, your timing must be off. I've never had that issue.