I agree with Ed on using plastic instead of foil for the dry-brining period. Foil has a different reaction, but I don't know why. Also, a mild fruit wood, like cherry, is very good on pork.
Greasiness: You are rendering pork fat, so they're not going to be like eating chicken. Ribs are, by nature, a little greasy - just like bacon. Personally, I think the good liquified pork fat is what makes them good!
It's not like any other fat!