I would not dare to laugh. I myself am still somewhat new and not everyone wants to be a tech guy, I just happen to be interrested not only in the results but also the tech and fiddling behind the scenes. Far too much actually, keeping me from playing more than I would like to. You know, one of those guys who tweaks the sound but canīt play properly ;)
What the PRS wiring I am talking about is is actually stunningly simple (or so I say....). When you split a HB you send one of the coils signals to ground, turning it off, like a fully turned down volume pot. What the PRS wiring changes is putting a resistor in series with the ground path. So between the to be shut off coil and the ground there now is a barrier. This effectivly works as a not quite turned down volume pot. So the coil it not completly turned off, but mostly. The effect his has is for one of course a slightly higher output, slightly lower noise (as the humbucking effect still occurs to a small extend) and (sides the output) the most important thing added bottom end. As you know when you roll a normal volume off you do not only loose volume, but also a bit extra treble, thus often the use of a treble bleed or 50s wiring, both of which make sure that the high end stays sparkly when you roll down for a cleaner sound. In this case this roll off of the high end is actually good since, as you noted, split coils can be thin, weak and trebly and this is remedied by the nearly shut off coil adding mostly bottom end.
So to recap: Instead of turning one coil you put in what is essentially a fixed volume pot to weaken it. What it then adds to the mix is mostly extra output and bottom end, bringing the sound closer to a true SC.
The PRS values used for this are usually 2k for the bridge and 1k for the neck. It is extremly easy to experiement with exact values though, just need two allicator clips.
There is also a variation on the idea using caps instead of resistors to lower the resonance peak, but I have not tried that myself (yet) and will not get into it right now.
If you have any more questions please do ask!