When you switch over to Carbotech pads, you generally shouldn't have to swap rotors as well. That said, I ran on XP8's (4.6L car) for most of the past year, including all last winter in NJ down near Philly. Yeah, they're a bit noisy from time to time and they do dust some, but they still bit good enough all winter once there was any heat in them at all . . . and they're a hell of a lot gentler on the rotors than HP+. As in far less wear in 5000 street miles plus 5 track days than the HP+ inflicted on a different set of rotors in barely over a couple thousand street miles.
I found I'd overheated the XP8's, and stepped up to XP10's (on the same rotors). So far, over ~1500 street miles and a 7-session track day the XP10's are providing much the same noise/dust experience as I had with the XP8's, with maybe just a little softer initial bite when cool. But they're still better than OE or Hawk HPS under similar circumstances. Time will tell how well they cope with the cooler weather that's coming and whether I'll want to pick up something else for the winter.
RBF600 went into the system when the XP10's went on.
What I found ↓↓↓ . . . less than half worn, with at least 0.28" friction material out of ~0.43" remaining on all 8 pads. No more track days for those pads.
Norm