This is for sure: Dakota or Ty or Jared or Dustin or either Ryan or any one of two dozen others would easily shave more than a second off your lap times driving your car. They can win with a brick.
Brian Kinwald, who drove for us for several years and can win with a brick, taught me this: R/C car racing is 50% driver, 25% tires, and only 25% everything else. That includes the brand of car. Assuming you've got the right tires and foam, that they are worn to the correct depth and you are using the correct dope, that means 2/3 of the problem is you.
Since the really fast guys don't bother with this, or most other forums, that goes for about everyone on here.