Spot on!Forget about time & go for temp. The meat temp in the thickest part of the rack should be 195, for tender & juicy ribs, but not quite fall off the bone. It doesn't matter if you foil or don't foil. Go by the IT.
Here is my method.
https://www.smokingmeatforums.com/threads/perfect-ribs-every-time-this-really-works.240916/
Al