Reading up a bit more it seems people are saying that a jack plate will not help fuel economy in a cruising boat. It is also becoming apparent that a 28" setback would be way too much. Maybe 12" if anything at all.
I do know that I could use a bit more stern weight to improve the balance of the boat so maybe the 12" setback would help in that dept. Maybe I would be able to lift the motor a tad to reduce drag and thus allow me to go from an 18 pitch back to my 19 pitch prop.
Any ideas would be appreciated.