[tsubaki]

The adjustable manual type will make you happy initially but cost almost twice as much as the fixed ones.
Once you get the height figured out, you will not need to fool with it.
Research real hard the one from Panther Marine, to me it looks like the best solution to your problem.
And when you get ready for installation, holler at us.
With the 4" setback, I'm guessing you will need the cavitation plate on the motor about 3/4" above the keel.