Need Help Putting the Middle PU in Series

[1ManGarageBand]

Hi--

I put a ClassicStackPlus-n in the middle on my tele between a PGn and CCb.

I don't want to wire the middle PU into my Torres wiring harness 5-way switch, so I wired it with a DPDT center-off (in-phase/off/out-of-phase) with the red (second coil) wire unconnected, the hot wire to the vol pot hot terminal, and the shield/drain and ground wires to ground.

When I turn on the middle PU with N/B/or both the volume is cut in half and I have to raise the middle PU all the way up to the strings get any of it's flavor.

QUESTIONS:

1.) The problem is that the middle PU is in parallel with the other PU(s), right?

2.) Is there a way to wire it in series with the other PU's without getting into the 5-way switch??

Thanks for looking and thinking about it!