i know exactly what you mean by the rears overtaking you when you slam the brakes down, as this happened to me when i was testing his valver out & i knew is ABS wasnt working but when i broke the rear slid out & i was like wtf & trying to control the car at same time.
anyway good to know your all good shame on the car tho (after all that effort was put into it) good turn around on the cab.