You pulled them way too early. When the bone wiggles free they're done.
No need to add vents I have a 22" Cajun Bandit sitting on o Weber OTG and it does just fine.
Lang 36 patio
18.5" Weber Smokey Mountain
22.5" Weber OTG with Cajun Bandit Conversion Kit
Char-Griller Akorn with side cart
1999 Weber Master-Touch - bent but not broken
14.5" Weber Smokey Joe Silver