Before I replace these Duncans, I think I'll get the pots looked at first. All passive, Duncan Precision pickup, and a Jazz quarter pounder from about 15 years ago. Here goes...The Precision pickup with the Jazz all the way down, tone anywhere...minimal volume as I rotate from 0 to about 3/4 up then dramatic full volume increase for the last 1/4 way up. Jazz pickup...smooth gradual volume increase from 0 to full. With the Precision pickup full open...start the Jazz from 0, minimal increase, reaches full about 3/4, finish the rotation and the volume dramatically cuts like it goes out of phase till you bring back to 3/4 where it has the highest volume. I don't know much about electronics. 250s 500s? Greek to me. I didn't hook this stuff up...couldn't if I tried. When I bought these pickups I think I remember getting a quarter pounder for the bridge cause I was more in my Jaco phase and thought the bridge needed more oomph. I was thinking going MV/Blend/tone, and if it balances out nicely like I hope, I may get a Tonestyler. Can anyone pinpoint the problem?