First off, I found 1.52 software has a startup problem with the c50. Don't know if it fixed the brake problem.
1.51 runs good, but if you use the brake function, it's really bad, thought it was gonna rip out the motor. If I wasn't using the brake this is the software I'd run. It's very smooth.
I use 1.23. Brake function works well. Startup is good, though a little abrupt some times.

Brakes set through the software, you'll need a castle link. Mines set at 5% now, you'll have to experiment to find the setting you like. Ramp and delay take your pick, doesn't really affect it to much. If you set the brake to 100% it will stop, 0% or off is no brake.

You can use either throttle setting, fixed gives you more consistant throttle setup, but auto works well.

I've used low advance and standard. It'll run well either way.

I set it to the softest start available.

13khz is the lowest you can go, and is what I use.