Thank you for your reply.

What would you reccomend for the transmission upgrade? And does the slipper clutch/spur gear need to be replaced with a metal one, or can it be the plastic type?

Is the lower the turn better? Because I replaced my 20T XL-1 motro with a 12T motor and I didn't notice a difference because the 20T was shot so I wasn't able to use it for 4/5 years/