It sounds if the hull will do well over 40knts then?
Good luck, you will need it if you hit any waves at that speed in an Assault Hull
I sold mine last year because I couldn't handle the ride at half that speed, any distance and we were sore for days.......
And the number of times we stuffed or slammed into quite small waves HARD is beyond counting.
I would dump it and put your engine on something much deeper V and softer riding as soon as you can, its a pretty crap hull all round.........
You will most probably drop some speed in something like a destroyer as it will be heavier for the same length and consequently have a larger wetted area and beam. But the ride will be very much drier and softer and the seakeeping immeasurably superior!
Either that or try and get hold of a Attaque, this would fly with a 115 as long as the boat rating would take it. Much the same size, beam and weight as an Assault but better hull form.