Heya, I've recently been doing CMs on my hunter and only have 4 left (Using Thrill/Crows/Barrage/Focusing shot)
However with the 6.1 change to stampede is it worth changing to stampede or keeping crows and clipping it?
Definitely go Stampede and use it on bosses which need it most and make sure to use it on as many bosses per dungeon as possible (based on time restrictions).
I finished CMs pre-6.1 and only used Crows because it was more valuable than Stampede at the time. It really wasn't useful on trash considering a majority of my damage came from multistrike (Serpent Sting) and Barrage.