I may not be able to help you much either, but I'll try. I finished my first round of Insanity the day after Christmas (and loved every minute of it). Right now, I'm doing an STS/Shock Cardio/Insanity hybrid.
I didn't stop doing Insanity workouts when my rotation ended, but I did cut them down to a couple a week. Honestly, my body is thanking me. I love the impact, but I'm getting very different results right now from going back to lifting weights, doing more step cardio, doing more steady state cardio, etc. But I LOVE the two or so Insanity workouts I do a week and actually am finding that I can push myself much harder in them doing them this way than I did during the rotation.
I would suggest you take a few weeks off, maybe try some other workouts for a little while, and maybe incorporate Insanity a bit in that 'break'....but just a little. If your body is anything like mine, it will appreciate the shake-up a bit. And you'll probably be able to push harder when you return to the program. If you do take a few weeks off, I'd go back to the beginning and start the whole thing over.
I LOVE Insanity!!!! Have fun!