Help! I cant make good track.

I had to chanfe alot heres a list of what I changed
-Tightened the track
-The wheels were touching so the were working against each other
-Gave the wheels more friction
-Increase the power of the motors
-Some of the pices of track were joined togher with a solid join instead of a pivot join.
-and joined the rc to the power supply to control the motors