trying to find the right motor/esc combo again

could use a little help folks:Ive raced an RCM .5 since march and ive done pretty well,BUT!My original set up was a .5 rcm chassis,a novak GTB w10.5 and a 5000 2s 35c.The tires i made up were on ofna mini truggy dishes w 10th truck tires and standerd foams.the truck seamed underpowerdedon the 10.5 so i installed a 6.5and it seemed better but it ran warm so igeared down and motored up to a 4.5with a 9tooth and for a time it seemed perfect.Now the tk developed a nasty habit of traction rolling and i looked it over and the sidewall off the tire was folding under in hard corners and the wheel rim would dig in and over it would go!next i found the trinity ultra firm tk foams and trimmed them to fit the dishes and now it realy works greatbut the more i developed the tk the more irealized that no matter how i geared it , it wanted to run above 170degrees motor and 120 on the ESCin about six min.and bashing in my yard it go200 real fast .so now i decide on a 7.5 HVnovak on 3s and now it run at 110 to 140 but its aufully hard to stay ahead of even with the EPA turned down to 70%.That helps on the top end but the punch is hard to drive for me in a race . I have all the ofna billit hop ups and my truck weighs 5 lbs on gtb/6.5/2s and 5lbs14oz on7.5HV3s.IM looking for somthing comparable to 4wd 10th scale buggy on 10.5 2s that wount heat coffee for ten minutes after your run for $300 or so.names and part # would be great. thanks for you suggestions.Doug