[adman]

I noticed you used the word "Veer" to one side.

Does it constantly turn right or left all the time or only
on startup?

Does it drive straight after the veer?

It could be a "stiction" problem in that a bearing, shaft
etc needs to break away and go to its kinetic coefficient
of friction versus static. It could be a bad brush in the motor
landing on some carbon and it takes a 100ms to burn through
before developing torque.

Alan and the gang are on the money for the depowering of the
the "fast side". Its been used for years. But how much its veering
should be looked into. Try taking the drive chains off and just spinning
the drive wheels. Do they spin easily on both sides? If so work your
way backward. Swap motors, drives. See if the problem follows a
specific component form side to side.

Check the alignment of your frame. When the drives are disconnected
and you let it slide down a plywood ramp does it still veer? Are the
axles parallel to one another. One slightly ahead of the other will make
it turn like a Radio Flyer steering system.

Engineers always want answers, so see if you can find some by
the simple experiments and observations mentioned above.

Hope this helps