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4 controls, 2 pickups, passive. What do you do?

I just pulled an ibanez pre out of a 205 and had the same deal, 4 holes. I went VVT and did a home-brew "varitone" cap switch. in the 4th spot. I put an orange drop 405 (the classic) a paper in oil (I think) 22, and for the last one I put something that barely did anything so would have a tone wide-open option.
Rocked that for about a year and it was fine.
A few months ago I scored a Bart 4-knob 918 preamp and have been rocking that since. I think I gave $50 for it used...
The pre is VV T-B with a separate tone knob. I put the volumes on a stacked pot and the treble and bass from the pre also on a stacked pot. I put the tone on it's own single pot. I did it that way b/c I didn't want a push-pull potentiometer to be my on-off switch. Instead I put a little swithch in the 4th hole. It's a perfect little setup for that bass.
OT, but if you every find yourself in a position to end up with a set stock ibanez pickups like they put in the 200-300 series bases, they don't sound bad for cheap pickups. Especially if you upgrade the pre to the bartolini 918 sereis. - I mean, I woundn't spend real money on them, but like i said if your in a swap situation or similar, they're decent pickups in that capacity.
 
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Based on my limited research, I thought that 2 tones in a passive configuration don't work well. Something like they don't work independantly?

I was told this config on a passive can work, but some extra things need done for it to work as intended, although this is the current config on my FrankenFretless.
what happens is each tone affects everything, not just its own pickup; that's why it's not especially useful on basses
a 4 knobs set up as I have 4 holes to fill. I am planning on 2 dual coil ceramic humbuckers.
are the pickups 4-wire?

how about volume, blend, master tone, then a switch for series/parallel or even series/single/parallel? one of those rotary 2-way or 3-way switches can switch both pickups at the same time