Honestly...... stick with the RG but change to a bump start version. It holds its own on a short tight track.

Play with pipe and gear combos. Get a JP1 + JP2 pipe and a 13 and 14 tooth clutch bell and test the 4 combinations you can get.

JP-1 + 13 tooth for super bottom end
JP-2 + 14 tooth for longer sweeping tracks

The combos in between for just that... in between tracks.

Sounds like your track would be great for a JP-2 + 13 tooth combo.