Separation dilemna

[Strat62]

I recently built a Jagstang-type guitar equipped with a bridge 'bucker and two single coils in the neck and middle positions. I wired the two single coils with a standard strat 3-way switch and ran that output wire to one of the two volume knobs I equipped the guitar with. I split the bridge "bucker by wiring it to it's own push-pull volume pot. The outputs from both these volume pots were then attached to the jack tip. Both volume pots do share a common tone pot. The sounds produced by this setup are very nice, but I can't run the single coils or the 'bucker separately; turning either volume knob only turns down everything, not just the pups they were wired to serve. I figured I could fix this problem by positioning a Gibson type 3-way switch between the volume outputs and the jack; putting one output wire to either side of the switch to separate the two systems, and still be able to run them combined with the middle position. Alas, all this has done is allow the volume knobs to run independantly from each other; all the pups are still combined in either position, as well as the middle. What am I doing wrong here, or is what I'm trying to do not possible? Is the common tone pot the culprit? Thanks for any light you wiring wizards can shed on this problem.

[Strat62]

FYI-I see there's been quite a few views but no responses-not sure if y'all actually had no idea,or were just waiting for me to discover the obvious Of course, it was the common tone pot. Both hot leads shared a lug on the tone pot, so the sc's and the bucker were still mixing. I removed the lead from the bucker and everything is now as I intended it: position 1: SC's in center, center/neck, and neck, pos.2: same as pos 1 + bridge split(up) or full bucker(down), pos 3: bridge bucker split/full. I'll just have to live with no tone control on the humbucker which is really no big deal. I can get some really stunning sounds by mixing in the single coils with the tone rolled off in position 2.