Dire Beast does not profit from BW. nor does Stampede. and they don't cost any focus, so there's absolutly no point in casting them under BW.
aMoC does profit from BW, because it counts as a spell cast by you.
for those who don't know: Spells do damage not according to a snapshot of your gear(and stats/proccs) when casting the spell, but to the current stats, which get updated and recalculated every hit!
example: You cast BW and aMoC simultaneously. aMoC will only cost 30focus, and do 10% increased dmg for the first 10 hits, and after BW expires, aMoC will also do its normal damage again. similarly you can cast aMoC 10sec befor BW, and aMoC will do 10% increased damage at ticks 11-20. (then when BW is active)