Counterbalance is the only perk that actually affects balance. Rodeo only affects it by making the firestream not veer off to the right or left as much -does buggar all really- and Persistence only affects hip fire accuracy. Now if Zen Moment were to pop up on the Arminius-D that'd be worth it, but it hasn't and won't because that'd be too powerful in Bungie's warped little brains.