I tried using a flexible door sweep rather than the plastic skirt and that did not work .
I am thinking of constructing my own Plexiglas platform to surround the bit to hold the plastic dust skirt. I would add a short 2" diameter PVC pipe to the bottom, put Velcro around it and Velcro around the top of my plastic skirt.
The idea is to confine the area to the immediate area around the bit.
Some of the problems to overcome include keeping the PVC high enough so that it doesn't interfere with changing the bits (I use the MuscleChuck system so I don't have to fool around with the wrenches at all, just a simple allen wrench with a long handle) and finding the right material that is flexible enough to ride over the carved areas and strong enough to not collapse due to the vacuum. When and if I get this project underway, I'll report my frustrations, findings and success if any, here in this forum.