My thermal pad was not sticky at all, but that may be due to me running in dirt while the boards were loose and a plastic end was opened up. The thermal pad just feels like a soft pad. I kind of wonder if it is part of the overheating problem in general. I know for me it is part of the problem because the FETs aren't making good contact with the thermal pad and the heatsink.

I ran it today. It ran good, but it did thermal on me after about 10 minutes. I tried to tape the boards so they wouldn't move around, but it just wasn't enough to hold the FETs against the heatsink. I have to take it apart again and I think I will remove the thermal pad and use some of the recommended epoxy to fix it once and for all.