CRT.5 conversion Need advice

[Shark413]

Just to clarify, the reason I am testing at 50 feet is because that is how long the main straight is at the track I run my trucks at (short tight track). So I need the fastest speed I can get for that distance, while retaining good acceration and reasonable temps. 35 mph is very fast for that part of the track (probably too fast), my 1/8 scale buggy with a .21 OS V-Spec hits about 28 mph down the same straight-away.