Top fuel is always readily available at my local hobby shop while Odonnel and Byron are always in and out of stock. I have been running Top Fuel 20% since I got into the hobby. Just got a Slayer used and they guy had broken it in with 33% and it seems to run great with hardly any heat issues. Basically alot to ask would it be better to stick with 33% or switch it to 20% that I normally run?