First off, I'm glad you and your vehicle were unharmed. That shaky feeling WILL go away, but it will serve as a good warning for you.

One thing I was told by several instructors at my NASA events was that race tires don't make the warning noises that race tires do and race tires will just 'let go' without much if any warning. You just found this out the hard way.

I would recommend you keep the TC on for a bit while finding the 'limits' of these tires. The car can recover WAY faster than you and you will get a feel for where the limits are while still retaining that "invisible hand" taking control when things start to go wrong.

Work up to your speeds slowly witht the TC on, you can feel it correct for you. When you are comfortable with the rythm, switch the TC back off and then work back up to that same rythm slowly and you should be able to feel the tires reaching their limits. You may even spin again, but I would recommend that you try "pushing it" when you are in a pretty clear spot, if that's possible.

When I was clear front and back for at least 4 or 5 car lengths, that's when I would start to push hard and see what the car would do with the TC on. I still need lots of practice and technique before I run with the TC off. This was also the recommendation of the head instructor, "Leave your computers on...", until we reached a higher level of the HPDE groups. I'm still in group two... when I feel I'm ready for three, I might just try a few sessions with the TC off before I move up.

Hope that helps... keep at it! Cheers!