well i thought i would post back on this with some rotten results.

i took the whole boat apart and put in a new stronger transom, got the rev counter working properly and then went
out and got a few extra props and done some testing.

By raising the engine up as far as it will go on the holes ive lost speed, around 3 mph.

i will see about getting a jackplate and maybe post some results, so ive not forgotten this topic, just not
yet got the jack plate sorted out and tested.

phill