The Middle+Bridge in Series and parallel with the Neck pickup was one of the memorable clean sounds I had got with a HSS setup.
However i much prefer the resistor trick(partial split) rather than splitting the humbucker coils to coax single coil tones, the way PRS does with their DGT models, although the resistor value has to be experimented with to find your ideal sound in your head.
I have two HSS guitars, one has rails throughout, I put a rail single in the bridge of it as well. Initially I had dual sound setup for neck & bridge along with a blender knob for wide choices, then I went with split all setup. I find myself using the split all setup more often as when using the resistor trick theres minimum hum if any and the sound is much closer to a single coil pickup.
Anyways, the fender swimming pool route is just the ideal one to just mix and match any config you want. The problem is when the factory route is limited to fixed default config so theres that.
The middle rails pickup does get in the way of the pick when i use it, so I switch to finger picking to solve that.
Personally my favorite is the traditional SSS config in a strat and HH in a LP guitar, gives me a reason to own two guitars
