answering your question to be perfectly exact in "expected" performance will be impossible.
1)the "ragged" edges usually don't make you loose rpms.. they will be where a crack will eventually start.
2)raising the engine on the transom could gain you some rpms, and mostly likely not gain speed.. you'll just be
blowing out the prop.
3) installing a 6 inch plate and setting the height at 3.50" below pad will help with the "chine walk" and with
it's load carrying ability. and become much more consistent doing it.
4) most of those engines made their peak hp around 5500 to 5600. it was very common with those setups for guys to
run a 24p raker in the cool air and a 22p raker in the heat.
not sure if i've answered to your satisfaction.. let me know if i've missed something.