no, the bandoswap swaps between a 1h/h2h set and a 2h set - there's a full explain in the bst vid. it doesn't do different 2 handers.
re: unity - you'll want to figure out what it causing it, per error messages and such - and then block if you are having a stacking issue like the
FAQ mentions - bsts do have a few dumb spells/abilities that actually casts a different rank than what it should under certain circumstances, so this could possibly be one of those.
if your pet is getting its velocityunity overwritten - we would reuse it if velocityunity reports that it stacks.
we will also cast it to give other group members (melee) haste if you have busehaste on - and again same thing with if the autotrigger says it stacks with whatever buffs they have