So I have a follow up with this test I wanted to share. I was trying to understand where this double/triple damage occurs in the formula for damage similar to this post on relics and It looks like it is in the same position.
https://www.bluegartr.com/threads/43101-Relic-3x-damage-formula
I fought flamingo in Rauan Gardens and adjusted my STR while using king of hearts dia3 to stay attack capped to get Caladbolg to 303+40fSTR base damage as opposed to the capped 303+41. This let me see a different value for damage when k was right after base dmg as opposed to after pdif or the 1.05 randomizer. Here are the numbers:
Wpn damage = 303
fSTR = 40
k = 3 (lv119 aftermath)
pdif = 3.75+0.5 = 4.25
Normal range calculation:
min = floor((303+40)*4.25) = 1457
max = floor(floor((303+40)*4.25)*1.05) = 1529
My actual range after about 40 swings was 1458 to 1529 so I know my fSTR was at 40 and not 41.
Then with aftermath the 3 options were:
k after base+fstr
min = floor(floor((303+40)*3)*4.25) = 4373
max = floor(floor(floor((303+40)*3)*4.25)*1.05) = 4591
k after pdif
min = floor(floor((303+40)*4.25)*3) = 4371
max = floor(floor(floor((303+40)*4.25)*3)*1.05) = 4589
k after randomizer
min = floor(floor((303+40)*4.25)*3) = 4371
max = floor(floor(floor((303+40)*4.25)*1.05)*3) = 4587
After about 50 procs the range I had was 4374 to 4590. That 4590 is only possible if the k is in the same position as the relic k in Divisorthoery's post on the Bgforums.