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"Life is too short to be diplomatic. A man's friends shouldn't mind what he does or says- and those who are not his friends, well, the hell with them. They don't count."
Tyrus Raymond Cobb
I cook till I see the meat sliding up the bone, looks like the bone is protruding from the end. Would wonder if your fire is hot enough at the grill level ( calibration of dome thermometer).
When I first started with ribs, I didnt worry about the basting/mopping during the cook. I got the ribs done - so I would know what to look for. Did the meat start pulling back from the bone like in the picture below? If not, they might not have had enough heat. I dont remember for sure, then ones below might have gone 6 hours.