I ended up trouble shooting with McWill over at AtariAge and after a bunch of idea, I finally had an epiphany. The GG would load some games, but not all after the mod. So the mod works. I took a hooked soldering pick and gently pried the pins forward on the cartridge slot, and voila! It works again!
Overall the mod is Intermediate if you're doing it yourself, but the results are outstanding. If you are going to do it yourself, I suggest using a 9917 board because it's the easiest.