Ok, so I did some experimenting and here are my impressions compared to the RTR stock esc/motor (xp-sc700, reedy 3300kv) and my newly installed Tekin RS and revtech 13.5t motor.

I started with the 18/87 stock gearing and the truck was horribly slow, little punch and no top end. Switched to a 20 pinion and it was better but still slow. I then tried a 22 pinion and again a little better but still slower than my stock parts by a lot. The motor was hot to the point I couldn't hold my finger on it for more than 5 seconds with the 22 and after about 15 mins of driving.

I'm thinking I need to make some changes in my Tekin RS. I have it set to linear throttle profile with no drag brakes and current limit at 13. Motor type is 1 and VC is 2. But, I am not sure what could be holding back so much power, still reading what settings are available with this esc.