novak hv bl trouble

igot gorilla max g2with extension chassie addon and g3 suppsion with integra piggy back shocks ,mip axels and novak hv bl.i was having trouble with thermal shutdown runing 70t spur and 14t pion run 2x 3800 6cell .then have changed to 2x 3800 7cell 12t pion 70t spur still having trouble with thermal shutdown . i have tried 2x 3800 7cell 12t pion 72t spur but have lost speed. got more torqe .does any body have any tips.or is this just a novak thing.if so what is th best bl setup