Yup. you nailed it. cook longer. I remove from the grill when they start to break about half way when picking up with tongs. I cook my ribs on the wsm now, but before that is was on the kettle. The kettle cooks faster but still delivered great ribs. 3-4 hours for baby backs on the kettle for me...
The lodge seasoning spray uses 100% canola oil. They are pricey so I just get canola oil in the bottle and it works great. Oil it after every use and let the CI breathe.......better than new!