I'm at a loss too - my playing style wouldn't sound like that no matter what pickups you put in :lol: I'm a bit more bluesy/messy!
ITs are very versatile, but you're right about the music being pretty dynamic (I assume you mean different levels required from the guitar, clean, pushing it, etc). What sort of amp are going to use, have you got clean/dirty channels available?
You said it was mostly done on HSS - I must admit I thought HSS when I was listening. Are you saying you want to stick with SSS? (Must admit I would myself, HSS doesn't quite look right for me). I would start thinking about base-plate on the bridge if you were going for ITs - but I don't know what that would sound like, never tried it.
I've got a real feeling you're going to need a humbucker in there as well though:?