Guitar Electronic Debugging

A list I'll try to update whenever I find a little problem that stumps me

Guitar (w/ humbuckers) buzzes loudly and the issue gets worse as the volume pot moves towards the middle

This one I encountered while adding a push-pull pot to split the coils in my PRS SE. I was checking all my grounds and resoldering them to make sure the issue was not in my solder joints but then I realized my output wire was soldered backwards. I soldered the output ground to the middle lug of the volume pot and the output hot to the case of the volume pot. Once I reversed those joints then the guitar continued without so much as a hitch. I'll  include the diagram below that I used

https://guitarelectronics.com/2-humbuckers-3-way-toggle-switch-1-volume-1-tone-coil-tap/