So, the assassin's strike on the bp works nicely. It's not a whole lot of +dps because of the nature of the sneak attacks (sometimes they do nothing, a little, or a LOT). However, the assassin's strike is now doing what daggerfall used to in that it kills the Epic proc. I'm guessing that whatever was done to daggerfall should be applied to assassin's strike and if it is an easy change, may as well apply it all the way down.
Deadly precision still kills the epic proc too if that helps in finding the problem.
Just got the tov pants too and no issue with that proc buff.