@Rufuso I run 2 instances of HD Overhaul on the same PC and I have 0 issues (no lag, no glitches, no rendering issues). My PC is an ASUS G11 with I-7 and GTX980. This PC runs 24/7/365 and I only log out for maint. There is an FFXI HD Mods forum that addresses monsters, gear, and weapons https://www.ffxiah.com/forum/topic/51963/ffxi-hd-mods . I hope this helps, cheers.
This link is the location where Amelilas keeps all the zones they've done on youtube in one mega file. A updates it when adding a new zone. Amelila's FFXI HD Overhaul Megapack Zip
note: please try and upvote all of Amelila's videos with a thumbs up when you see them, it lets them get more traffic.
@Rufuso I personally use the Color Blush preset for my PC, you can manually adjust ReShade to your preferences. I use shift F2 for toggling the ReShade menu and shift F12 to toggle the current setting on/off. The best person to ask is Amelila by making a gmail/youtube account then a youtube channel and commenting on the reshade set up video https://www.youtube.com/watch?v=MwjxMSnsQ_Y&t=145s .