Can you please post here or Dm me the written instructions of the wiring diagram of your SG to mix the pickups the caps pots that you used because you have me interested friend.
Ive always been one to roll off the volume or tone on guitars to say get that smooth sound and then dime it for the presence.
I recently acquired another WELCH WG 59 $200 used and as a platform to upgrade these guitars are the deal nibs fret edge binding long tenon
Maple cap mahogany body a beast in this one is just shy of 10 pounds on the scale weight wise.
I acquired one years ago and never parted with it after replacing bridge tuners pickups pot caps even the original tail piece is aluminum I kept it.
Do not know much about them only that some guy in NC was having them made in Asia.
Then he would assemble them here in North Carolina.
Teles
SG
Les Pauls his 59 version is what I picked up used.
And I think he offered a 60s version of les as well.
Alls I know is in reading about his operation is Gibson lawyers came knocking and he shut down.
You know just google Heath Welch guitars friend I ramble.