I think that Stardiver's Crit Rate -% is likely on the order of +5% Crit rate, and it lasts 1 minute regardless of TP at the moment.
WAR with SQ, GH, RR, 5/5 merits = 85% base rate
Base = Non-crit pretty quickly (1 WS)
Base + Rancor Collar = Non-crit pretty quickly (2 WS worth)
Base - SQ + DD (95% base) = Can't get a non-crit (5 WSs worth)
I was using a 1H weapon (tempting the gods of Fencer) for all the tests after the initial Stardiver to put the debuff on. Fencer cannot cap my crit hit rate though (for some reason, idk how it works), so non-crits with Fencer are still valid. Someone on FFXIAH (Xyph) might d-box me a k-club, so I'll test more after that.
XI Wiki


