If you setup right then heat won't be an issue. I really don't know how much speed the hull can reliably handle as I have not
done much in terms of testing. You on the other is the one more qualified to answer that.
How does the hull behave at those speeds? If you can do full pass runs back to back then that's a good indicator.
I am sure the water conditions play a good role in achieving those high speed runs.
I am just thankful that you are recording everything in your trial runs.
By the way, the strut height dictates how much ride height the hull is on or off the water. Move in 1mm increments and mark your reference stock point so you don't end up guessing how much you've adjusted. Keep that shaft well greased and more success in your tests!