Typically I never needed to stack more then 2 of the buffs, usually the relic and adrenal. My HS was critting in the 6k range.
I'm in half champ gear with 8 BM pieces, sitting close to 600 expertise.
Today I'm lucky to break 5k on a HS.
Lacerate, shiv and Backstab are also hitting like a wet noodle.