I have the full 6p bonus on my toon but when I have Sims up, I receive no sheet toughness increase. This intentional or not?
Yes it is normal. When you have Simulacrum up, your true toughness is six times your sheet toughness.
It’s surprising how tough this makes you yet you still feel squishy lol
MotBC is actually one of the tankiest builds available due to excellent toughness combined with Decrepify debuff and Leech life gain. As long as you don’t play recklessly, the build can comfortably face tank most enemy attacks in GR140+.