I´ve worked a lot with KISS and AUTOQUAD trying to get it working together since KISS is a very good ESC, cheap, simple and very performance. But I did´nt get allways a success history, mainly in larger mounts due to hard frequency couplings between frame , control and KISS (it has freewheeling).
I found very difficult to get a reliable configuration robust for frame changes (like weight, gimbal, battery, etc). Tuning is difficult (always using PIDs) but when you succeed, then it´s an awesom copter, with a super precise and robust flight mainly under wind.
There´s a number of post and guides in our wiki were I show diferent mounts. I normally succeded with small mounts (< 700g copters) but with large copters you must have a lot of care with the design.
After a lot of tries and study I could isolate the potential frequency coupling problems by using a very stiff frame (freq > 161 Hz) and the right control parameters tuning (PIDs.)
The video below show the maiden test flight using exactly same frame that I use for QUATOS, ESC32 (flying very well) but now usin PIDs and KISS. It flies very very well. Acc levels are negligibles, very small, below 0.5m/s2 in hovering.
Tunning was not so easy. In general I needed to low a lot many of the Tilt params, including Fterm. Attached the params I´m using. Main changes wrt deffaults:
TRD = 15000, Fterm = 0.125
TAP = 150
TAD = 6000
Enjoy
Angel