I have tightened it as much as I dare. I can barely move the compound but it still has a movement up and down. The compound is solidly in contact with the cross slide and the new 4 bolt mount is working as expected. I have extended the lever with the new QCTP but with the light cuts I'm taking in aluminum, I shouldn't be seeing any movement of the compound.
This is a 9X20 Grizzly.