I've had my RC51 at NJMP a bunch of times and it's a great bike for that track. Thunderbolt is a fast, smooth, and open track that's easy to learn. I expect to do half dozen days with Tonys Track Days at NJMP next year, but I'll usually have my CBR1k with me.
I don't know if you plan to go to NHMS too, but NHMS is a more technical track that's a bit more fun with a smaller, lighter bike.
It sounds like you've decided to use the RC51 at the track and I think you'll really like it at NJMP. The downside of the RC51 is turn-in requires more effort than a 600 or the CBR1k, but NJMP isn't a quick-turn, point-and-shoot kind of track.
I hope this helps, maybe I'll see you at NJMP sometime.