Ah EZ Drummer - should have recognised it, an excellent piece of 'kit' :)
Unfortunately can't listen to clips at mo, but will do so as soon as possible, interested to hear difference.
Regarding the selector, I'm sure the more technically savvy guys will correct me if I'm mistaken but that is the bridge in parallel with the middle pickup but out of phase - you could wire the coils of the bridge pickup in parallel (or via switch) if you have 4 connector cable, which would give a more single coil like sound, then would be very flexible setup... No experience of HD, only the Crawler which I am very happy with - I have posted some clips up using it through my JCM800 if you wanted to hear it for an idea...