Re: JB is driving me NUTS!
I had an issue where a JB in my SG Faded (mahogany) sounded dull and flat. But with a 500k pot believe it or not it opened it up for the better along with the Jazz in the neck. I gained a lot of clarity and don't find it trebly or ice picky, but keep in mind the SG Faded is a VERY dark guitar to begin with. It's now got the punch and power it otherwise didn't have and sparkle in my mahogany SG.
So for some, like me 250k was not the solution but the problem. Take it for what it's worth.
I also hate the 300k stock pots Gibson uses. Atleast in this specific guitar. It's my only Gibson so maybe those pots are wonderful in other models.
I just hate anything that sounds muffled.