Car running a bit warm

[Jamie B4]

Hi wonder if anyone could give me some advice:

1) Ran my X6 sq on saturday and had a Novak L 7.5 go down, I've noticed that the car is running very hot - changed the motor and speedo to LRP, cut extra holes in shell - what else can I do

Gearing is 7.5R Novak - 78t spur - pinion was a 25 went down to a 22 - dont like it running this hot.

2) Can someone also advice if there are standard parts so that I can run longer axles ie losi spacers or something - car seems sloppy on rear wheels - parts numbers would be ideal.

Many thanks