OK, well see, that a bit of a different deal then.

Thing I made is powered off main battery, to deliver stronger power to the servo only. BEC from ESC still powers receiver and PT, but it handles that fine. I have a QC esc with low bec output. My spektrum didn't work unless I used a cap. Even then, when jogging steering left and right, the PT light would blink indicating a sever drop in available current. Now everything works good.

Going to give it a full day of race testing today.