Cool Thanks guys, I do plan on sticking with 540 motors so maybe I will try 48 pitch 1st. Since I have all the pinions already.
I have a couple different motor options to try

Hopefully I do not have to take the 550 plunge, most tracks here I will run on are indoor and a tighter layout.
Do you guys carry extra belts with you at the track ? I will order up a clicker assembly and maybe the basics.