All great advise from previous post.
Baby backs will cook faster than spares and St Louis ribs.
I do not spritz ribs.
When foiling I use real butter or bacon fat. For sweetness, options are endless. Jams, jelly, honey, maple syrup, cane syrup, molasses, brown sugar, maple sugar or fresh fruit. Liquids used are apple juice, coke, white grape juice and Mexican flavored sodas.
Cheers