no I wouldn't change setup much.

Look at tires. Tires. Tires. They MUST be broken in well and use some grip to help. Look at what everyone else at your track is using. make sure you glued your servo savor nicely bc that can be causing you sometimes pushing or spinning but it sounds like new tires

ik this feeling, take em to some sandpaper to speed up the break in. Grip definatly helps the break in also, some wd40 softens the tires up also but don't overdo it. Try coating it a day b4 you race and throwing them in a bag. If you want cheap grip, go 50% denatured alchohal, 50% wd40. It works better since it dries much more quickly.