Hi LuckStruck,
Your Talents and Gear are all right, just get some more hit by reforging the crit from your chest, main hand and 2nd ring. You should at least have 16% or better the full 17.00 % for raid bosses. You should maybe change the gloves or helmet to get the 4pc bonus as it is very good for movement intense fights.
Refreshing VT and DP with procs is always the question: is DP about to fall off, do you have to move and already did SW
, Shadowfiend and PW:S then refresh it! Refresh VT with procs only as it is more about to fall off, not after you just cast it.