I do mine overnight, usually about 14 or 15 hours in the fridge. I use either the BRITU rub or Memphis Magic Dust, applied evenly but not excessively, place them on a baking sheet and cover with saran wrap. I never let them come up to room temperature either. From the fridge straight into the WSM and up to temp.
I've never found a liquid pool and unless the ribs are "enhanced meat," I almost never find them too salty.