Ohh I took it literal when you said to only make sure one WAD file is placed in the PrBoom-Plus folder, and that's why I didn't move "prboom-plus.wad". Also while you're still here, does that xml shortcut basically let you run Doom 1 and 2 separately, but still through PrBoom+?/etc/ folder goes at the root of the SD card. Everything else is set up fine.
It kicks you back to the home menu because you haven't put a game WAD in the PrBoom-Plus folder as well
Thanks a lot for the kind words! And sure thing, that was kinda foolish of me to forget, haha.