Thats the second suggestion on the reversed coil strat thing, must be something in it. I use the neck pick up for most lead parts in high gain mode, it sounds so nice. I suppose its really about controlling the hum, you don't hear it when playing, only between songs, if I leave the that side of the amp on. The electrics appear ok under the scratch plate, although I have not checked anything on a meter (wouldn't know what to do). I am going to leave it alone, I don't want to spoil the tone.
I must sound like a real novice, I have been playing for 34 years (basically I'm an old f***er), & I play regular in a good band. I do tamper with guitar electrics mainly restoration projects, but that don't mean I understand it.
On the P90's & the Les Paul DC - I love them, you will never get that Fender twang out of them, they are bright & jazzy when clean, & sound really nice overdriven as well, they are much more powerful than stock Fender USA single coils & they don't hum. The guitar is stock & I have not had to touch the truss-rod since I set it up in 78 when I got it, a testament to the workmanship I suppose. I have used it for all sorts of styles for all of those years, its just a great guitar that suits me, everyone thinks its an SG when I play it.