I have a 2520DV (deep vee) with a 250hp Ox66 on a bracket. The boat generally cruises, in calm seas, at round 25mph at 4300RPM's. Sometimes a little more, sometimes less. In very heavy seas I will slow to 20mph and slog through them. Otherwise, 4500RPM's typically is around 27 mph. WOT is high 30's.
Ideally, I would prefer a single 300hp on this boat, but they are too new and way too expensive for me to consider it. I hope to get another 1500 hours out of my very reliable Ox66.