How did the toothpick feel when inserted it between the bones?
Could be a lot of things....might be you had enhanced ribs and you put a lot of salt on them...could be the ribs were overdone...how long you rub ahead of time?
It does seem a long time at 225*, but what do I know I tend to cook my ribs a little hotter.
Sure wish you had slid a toothpick in them and we wouldn't be guessing as much.
Didn't you get some RR with your cookshack? I've had good luck with it, just add a little salt and pepper to your rub right before you cook.
Hey if your doing more than one rack, cook them the way each of you likes.