Ok, so you're wanting to switch the phase of the bridge and middle pickups relative to the other pups. What brands are the bridge and middle pickps?
For the bridge humbucker the black is hot, green is ground, bare is the shield, and the red/green pair is the series link between the coils. Your Seymour Duncan diagram works for this. Separate the bare wire and connect it to ground (back of a pot etc) then connect the black and green to the DPDT switch as shown. The black wire leaving the DPDT then connects to your pickup selector or volume etc.
Your middle rail appears to use different colours: red/green as the series link, which makes the white and 'black' as the hot and ground respectively (probably). I have a feeling the thick 'black' wire is actually a black wire and a bare covered in heatshrink, which would be your ground and bare shield pair. If you can peel back just a little of the thick black wire's covering from the soldered end and see if it is the black and bare pair. If it is, then you'll need to separate them and connect then bare to ground/pot back, then connect the white as hot and black as ground to your other DPDT switch. Make sense?
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