It depends on what Ballistics you use. If you use something with a Stability penalty, like Aggressive Ballistics for the higher damage, then it is very inaccurate without Perfect Balance. You use Smart Drift Control & CQB Ballistics. Neither of those is "base" Stability. They both have massive Stability bonuses, with changing from Aggressive to Smart giving a Stability increase almost as large as Perfect Balance. Smart Drift/Field Scout versus Perfect Balance/Aggressive Ballistics is a preference. One has a bigger magazine and gets a bit more ammo while the other has higher total Stability, higher Range and more 3HKO scenarios. Again, as I said, the perfect rolls are what I would use. I put an alternative as many do like Field Scout and you'll notice I didn't mention the need for any Stability perks when using Smart Drift Control or CQB Ballistics, as indeed, like you say, it is good enough.