John, you need a bit of time to play around with the height, oh and three lads to change it. If you planning on making that trip next week then I would leave it alone. But start with the cavitation plate at least an inch above the bottom of the hull, I am assuming you have a S/S prop.
Ignore the offset unless it handles crap, you will only have another set of holes in the transom to worry about. I did move a 150 Mariner from 2" to Stbd back to the centre line with no ill effects on a 6.5m Ribtec.
Ribnet is best viewed on a computer of some sort