Hello, jerry
What you have up there is too much for that little rotator. If you must use a small rotator, you should use a thrust bearing, also called an alignment bearing. They are a necessary item, but most manufacturers have discontinued them.
The trick is to get the rotator and bearing in alignment so that the axis of rotation of the bearing is the same distance away from the mast as the axis of rotation of the motor.
http://www.ad5x.com/images/Articles/TB105.pdf
DXEngineering sells the Yaesu Rotator Mast Bearing GS-050
https://www.dxengineering.com/search...rder=Ascending
https://www.dxengineering.com/parts/ysu-gs-050
You would have to be handy with tools to make it work.
For that much antenna you need a ham rotator, but they are more expensive.
https://www.dxengineering.com/parts/ysu-g-450a