When smoking ribs do I need to be worried about cooking them to long?
The ribs didn’t fall off the bone like I wanted them to
First by all competitive and logical BBQ standards ribs that fall off the bone are overcooked ribs. A properly cooked rib will cleanly come off the bone without resistance when bitten not not be falling apart.
If you goal is a rib that is falling apart then, yes you didn't cook them long enough. Possibly not hot enough either. I go four hours at 250 without opening the SI. In the Ole' Hickory's I wet the ribs after three hours. The OH is a lot drier than my SI #3.
Raise your heat and cook longer if you want looser ribs.