Hi Axel,
I did have nice results with a couple of blue bird servo's. BMS620 I believe. Those where analog servo's and not to fast.
But, no jittering

. Just what I had in my left overs and performed quite good.
Better were a couple of futaba heli tail servo's 0.07s digitals, S9253 as I recall, don't believe they can be purchased anymore. Align (savox) DS620 are also very good and fast 0.06s.The futaba's I did use last year..
Now I'm experimenting with savox 1258TG, expensive but incredible fast.
But, savox are known to be very power hungry, no way you can feed them from the AQ and even my 5A bec did shutdown once.
A 10A bec is on its way for those servo's.
Anyway, the fastest analog servo's would be best, no digital jittering, but the next best thing are a couple of heli tail servo's up to the savox or futaba BS $200 a piece versions

Just what you need, if you need the absolute direct counter actions you need the fastest you can buy, for profi setup you should consider another gimbal obviously but for the occasional shoot it is a very nice gimbal.
Setup: the standard setup is sufficient for most, but if you need to finetune you can change the scales, the frequency and introduce a simple expo on the roll.
Let's hear what your specific questions are Axel