I have a strange issue going on here.
This is a TBS Disco on 4S, T-Motor 2216-11 900kv, Maytech Eagle 30A SimonK ESCs, Spektrum AR7200, DX7.
I swapped out the stock DJI 30A ESCs with the Maytechs, performed throttle calibration of the ESCs, re-calibrated the TX through the NAZA assistant...