When you run the Tekin RS with the booster, leave the main power switch OFF or it will overheat the esc. The booster will back feed the power to the esc automatically. You also should go into the HW software and click the "1S" checkbox. If your running a 17.5, I would also go higher on the throttle profile.
If you are running spec tires on the new CRC carpet, glue the front sidewall of the tire all the way up and even 2mm on the top. Once you do this the car will be fast and smooth.
If the side leaf springs are yellow fiberglass, then it's definately the DB12RR