Sometimes when my BC is ready, I also have enough rage for Rampage, and if it is the case, should I use Rampage after activating BC or should I still use Bloodthirst after activating BC?
Use BC inside the Rampage animation so that they 4th and strongest hit of Rampage will always be a crit. The timing for this is right after the first 3 Rampage Hits, so its pretty much 1, 2, 3, BC 4 crit and then standard BC Rotation. This still allows you to fit in the two RBs inside of BC.