Hori Pokken DX Controller Padhack

Heya this is my first post on these forums because I’ve found nearly no info (from endless googling) about padhacking this stick. I’ve got a lot of free time at the moment so I bought one and managed to get it almost working but I’m completely stumped at the moment.

I’m actually dual-modding my Qanba Q1 to add Switch functionality (would much rather UFB but that price is a major barrier). All of the buttons work individually but when I put the whole thing together the buttons seem to be shorted out constantly (I’m assuming through the Qanba PCB). I’ve read that diodes might be required for this dual mod but I have no idea what kind are needed and or where to install them.

Any help would be amazing. I can post pictures if anything is unclear.