RE: Front carb RCGF 20cc or other?
Great that your 20cc is running well now!!!
In regards to your Hellcat and 20cc... as soon as you can... add a little more gas to raise the oil/gas ratio slightly....the 20cc will definitely give you more rpm......Once you switch to synthetic, you will get even more rpm coming from the engine.
The prop size is great for the engine. I look forward to your flight report.
Cheers
Henry