Re: RWRP vs non RWRP on a strat
My (albeit limited) understanding is that it means reverse-wound (i.e. counter-clockwise vs. clockwise) and reversed polarity (positive swapped for negative). I believe that maybe the magnet is reversed, too? (Or that might be unneccesary if the coil/leads are reversed, I'm not sure) Typically this is done on the middle pickup of a Strat. Anyway, the idea is that when the RWRP pickup is used in combination wtih other pickups, you add together the signals, but only the noise from each pickup is out-of-phase, since it is independent of the winding and polarity, so that it cancels out. The signals produced from the guitar strings are not out of phase.
I would guess our Strat probably is RWRP on the mid pickup. One way to tell is to look under the pickguard - usually the wires are different colors (i.e. yellow instead of white). Another (easier way) is to see if it's less noisy in the combination positions.