DF-03RA OVERHEATING :( Gearing Ideas?

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Hey guys just picked up a DF-03RA, running the largest stock spur and smallest stock pinion (29/78) for a FDR of 8.22 on standard TC tyres (waiting inserts for the rally blocks) using a Traxxas XL5 ESC and a Kyosho X-Speed 20 turn motor, after 4-5 minutes it just gets uber hot, and the motor makes some pretty funky noises

Any ideas on how to gear for this and a 15 turn motor I have? Puzzled how it'd be with Rally blocks which I'd assume would need higher gearing as they are slightly taller tyres, effecting rollout etc etc.

Running using a 6 cell IB4200 pack, haven't even thrown my Lipo at it yet!

Any help mucho appreciated!