Okay, I'll go through and check all my wiring and soldering. Hopefully it's just that. I've tried with 2 different speakers now, so I don't think it's that. I'll try different wires maybe. I've posted on the SudoMod forum too, so I'll hopefully get a response there too.
Yeah, It's pretty fun, and frustrating XD I've never done much with hardware before so it's a challenge! Once It's all done I'll probably make a post about it, and I'll link it here :)
@applePie unlikely as it would mean having to build things to use pulseaudio, which is not desirable for most users.
Perhaps it could be optional for retroarch, although I have not tried pulseaudio with bluetooth - if you are having trouble on the desktop, it's likely something we can't fix (related to bluetooth stack etc). RetroPie is just a system to install/configure emulators, we don't interfere much with the basic OS.