"Leon" wrote

Actually with a Festool shop vac there can be too much suction from a shop
vac, it tends to cause the sander to stick to flat surfaces and too much
suction makes sanding more difficult, so you turn down the vac motor
speed. That probably creates the same effect as your suggestion above.

Festool has a variable speed control on its vacuum??

Does it have a built in beer cooler too? ;-)