RE: temp change with different fuels
Nitro % is a factor in engine temps. Lower should run cooler. The glow plug can play an important role, too. Many people run a plug in winter that is hotter than the plug they run in summer.
Cooler plugs have fewer loops in the coil and have thicker coils. Hotter plugs have a tighter coil and a thinner wire.
If you have a hot plug and high nitro, you could raise engine temps...but so could running lean, and not much can help that other than a carb adjustment.