Hmmm, depends on track and car.
Never heard of programming BEC voltage before..... If it's right, set it for the max. voltage, the servo can take. This give you the fastest steering.
I've disabled my drag brake, since I'm using a one-way system.
I'm also using maximum brake and ABS, due to the one-way, but I do it from the TX. It's easier...
I use minimum throttle, so my mod-ESC fit my stock motor better.
I'm running on carpet, so the rest goes like this:
Start current, cont. current and acc. time, I just go for maximum.
Hope this helps.