Way overdone as in they weren't holding on to the bone at all or way overdone as in they were dry and tough?
And oifmarine2003 is right - 3-2-1 is more commonly used for spare ribs.
How may racks of ribs have you cooked?
It took me about 30 tries to get really excellent ribs. And you need to practice often as well. At least once a week. Also be sure to keep a log so that you will remember what you did last time and what you want to change for this time. That helps a lot.
Above all else . . . have fun!