With Costco, the company that packs the Baby Backs already takes them off.
think it was a freak thing. im going to do 1.5-2.5-1 next time. i like them fall off the boneI buy ribs all the time on sale and freeze them and have had no issues with them being tough. Is this the first batch of ribs you have smoked or is this a freak incident where the ribs just didn't' get tender? If they were you first time maybe try leaving them in the foil for longer next time. The 3-2-1 or 2-2-1 in your case is just a guideline and can be adjusted to fit your needs. Some like them more firm and some like them fall off the bone.
Only problem was the Ribs were very well done and tough. They were smoked at 220 for 5 hours (2-2-1)
ABT's were insane.