I have the wiring schematic you were after here Mr Tom. It's the same as the wiring in my strat (except you have a master tone) so I can vouch that it works.

It gives you the following options:
Push Pull Down
Pos 1 = Bridge (full)
Pos 2 = Bridge (split) + Middle (parallel)
Pos 3 = Middle
Pos 4 = Middle + Neck (parallel)
Pos 5 = Neck
Push Pull Up
Pos 1 = Bridge (full)
Pos 2 = Bridge (split)
Pos 3 = Off
Pos 4 or 5 = Middle + Neck (series)
I used the BK humbucker colour code in the diagram, but I'm sure you're sensible enough to be able to work it out. (and if not, maybe you need to buy the BKs)
I've noticed a weaker sounding mid&bridge combination, and I hink that's just how it's supposed to be :drink: