What mill are you running?
Top Fuel is not a "cheap" low end fuel. If you mill runs well, holds a tune, does not overheat, and has decent power, I really dont see a need to change. Its not just the brand, but what blend, oil/nitro. I have never run Top Fuel. I have used Trinity Platinum 20 and 30%, Monster HP 25%,White Lightning 20%,the BLUE junk 20% and TQ 30%. The only one I didnt like was the WL. It was just a pain to tune on my Traxxas 2.5. The 2.5 liked the MHP 25% the best, for me.
In my Big Blocks, The Trinity stuff does well, and the TQ fuel was great.
Byrons seems to be a good choice too, have not heard a bad thing about it.
Do you race and bash? If both, if you like what you have, stick with it. if you just race, moving up to 30%(with less oil content) or even Top Fuel 33% would be a good choice.