I have been neglecting the GPUs a bit lately, but I have time to resolve some issues now. I have tried different ways to mount the GPUs, and we have found the best simple way to prevent GPU sagging. Using the waste ends of the 1x4s and some binder clips the GPUs have better support.
Before:

After:

This is like $12 for all those clips! Who needs to spend a bunch of money on GPU suports? Make 'em your self!

We made a short video showing it all.
https://youtu.be/2H4tFPQnxCQ