Error Compass Variance Rover w/Here3

Trying to get this unit to track with the RTK unit. The tune for skid steer is very hard. I have ERROR COMPASS VARIANCE when moving fast or turning fast. The unit shimmys back and forth when stantionary in ACRO mode with a tap of the stick. I had the Here3 extended with an i2c jumper, then decided to solder and shield entire cable. (see pic) I taped the cable below the lid to try and keep it away from the motors. The Here3 is on CAN 1 (which says Can 2) I have logs. It would be great to be directed to a skid steer tuning video. Some of the params from McKay video do not apply to tuning skid steer.

Photo and Logs Link