I have Michelin Pilot Sport PS2 ZP RFTs. Sizes are 225/40ZR18 on the front and 255/35ZR18 on the back.
I thought these tires were really good for RTFs. They didn't break loose abruptly and I find them to be quite predictable after a couple laps. I didn't notice any decrease in traction throughout the event. Perhaps it's because the tires only have a couple thousand miles on them.
When it comes time to replace these, I don't think I'll buy RFTs.
I look forward to reading about your impressions of the LSD on the track!