Some of the effects could use a bit of a tweak in my opinion to balance out how powerful each one is, especially if the intent is to make these useful but not quite mandatory effects.
In particular 2 imbue/sneak dice is a little too strong, that’s very near what you get for a 3pc legendary set, I’d limit this to +1. Or maybe just replace with 1/2 deception/seeker.
The +20% threat was problematic, not really high enough for tanks to care and awful for melee DPS, glad to see it go. Maybe replace it with fortification to keep the tanky theme.
Conversely I’m sad to see the -20 threat go, hate tanks wouldn’t care (going from +1400% threat to +1380% won’t make a difference), and this would have been very nice for some melee builds. But if we’re set on scrapping it how about replacing with fort bypass to go with the bluff/sneak attack theme.
The plain skill boosts are very underwhelming, easily the most disappointing ones. Maybe add Amps to some of those, and lump the rogue skills together
+1/2 heal,repair, +3/5 Hamp,Ramp
+1/2 Spellcraft,perform,conc, +3/5 Namp
+1/2 Open Lock, DD, Move Silent, Hide, Search