Originally Posted by Rodan
It does seem to be mounted very high -
Any other ways to deal with this - without raising the engine.
You probably mean "lowering" not "rasing".
What you could do before you weld the holes, is to put in some plastic padding or likewice. This will give you an idea about the effect of welding the ventholes. If this helps, take out the plastic and weld. We have been there, and this was the solution for us.
You could also try other props. A Bravo I is a good old prop which works geat for everything except top speed.