I am currently trying to dial in that same setup. I started with a 22/78 (way too low) and have worked my way up to 28/78 which I was running yesterday and the highest temperature reading I could get was 123 degrees running full packs back to back. I have a 30 tooth pinion and a 75 tooth spur to try out next time I am at the track.

I am using a Novak Ballistic 17.5 with a Mamba Max Pro set to use "Smart Sense" with normal timing. The physical timing on the motor is as it came from the factory.

-Chocula