[Steve_Alaniz]

If you've calibrated the Victors and if you're using the Chicklet, calibrated the joystick, then numerically, everything is equal.
One thing that could be happening is that the motors are biased to run in one direction. They run faster (in general) forward than backwards. That could cause the arc you're seeing and in both directiions. By the way, I'm seeing the same arc you mentioned in my mechanum platform so it's not unusual.
I tweaked my numbers and got it to run straighter and I'm incorporating some feedback that is also helping with the strafe motion.

Steve