RE: 20% vs 35% fuel "my results"
A higher nitro content normally runs cooler 'cause there is more unburnt fuel going through the engine taking the heat out. But in saying that if you increase the nitro content you normally run cooler there for the piston/sleeve expands less and wears in a different way. its not a bad thing to change nitro content its a bad thing to run your motor at different operating temps. If you've run it for 6 gallons at 300 you should keep running it there, 'cause its to late to change it to running at 240.
just my 2c