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You got an incorrectly wired harness, nightmare!
I chose 50's wiring just as a change, it's easily reversible, you just swap the cap position. My understanding is that the cap acts as a high pass filter to ground, so depending on whether you place it between signal input and tone or output and tone, the treble rolls off differently. 50's wiring preserves treble when rolled off, and I hate a muddy rolled off sound so I'm keen to try it.
I replaced a split coil circuit with standard series linked, with the intention of putting in humbucker shaped P90s later, so was expecting zero difference in the humbucker sound. Maybe I'm misremembering, but it sounds way more clear and dynamic now. Thought I was replacing 500k pots with 500k pots but perhaps not.
Fifties style roll off is interesting, will take a bit of getting used to. I'd see so many guitarists talk about getting great sound from rolling off vol/tone and while all I seemed to get was mud.
^^nice job dude. very tidy. I'll be honest, I'm not sure what 50s wiring mean for a dual humbucker guitar. The shitty job i did on my Riviera was supposedly 50s, but i ended up leaving it with the tones disconnected after i had all that faff with the harness i ordered being wired up wrong. Have been waiting for lockdown to end so I can take it to a tech.