OMG, no, I'm not in Phoenix
I'm 90 miles North, up in the mountains, at about 5200 feet, MUCH cooler! Dallas heat was too much for me! But I LOVE TX and miss everything except the heat!

I'm sure you've read the thread Solitude included, but in a nutshell, Tim at StreetBoutiqueCustoms in the Phoenix area created a metal one piece bracket that replaces the two plastic clips attached at the bottom of the GLASS, the clips often break. Just another one of the problems in the long line of problems we almost all have with these freaki'n windows.

The metal bracket not only holds the glass firmly & raises it securely, they also allow you to move the glass a few mm's toward the back of the car when you're installing them, to relieve some pressure/friction on the front leading edge of the glass, which seems to contribute to the binding issue.

Solitude & I have the benefit of being within driving distance of SBC. Tim's installing my brackets in the next week or two. My clips haven't broken yet, but we now live in a rural area with many dirt roads with ruts, washboard, potholes, etc...so my clips are bound to snap any day as my poor VX gets shaken to death!

If you haven't already read, use silicone spray in the rubber track to minimize the friction, works great!