All right, time to bring this topic back.
I still think there's a major problem with the balloon buff. Even when you make a small altitude adjustment with it, it's incredibly easy to overshoot a target. If we look at the other buffs:
There is no downside to a hull buff.
There is no downside to a gun buff.
There is no downside to an engine buff (the extra manoeuvrability is much easier to control than a balloon buff).
As a result of this, the balloon buff is the only buff that can be genuinely detrimental to leave running (apart from a buff on only one of the turnings, but that's irrelevant).
All this is because of how the buff reduces vertical drag, which makes it hard to slow the ship down once it starts rising. Having the buff increase vertical acceleration instead would provide the extra rising/falling speed without being detrimental.
TL;DR: Buff the balloon buff.