Noah,
My original setup was a Cribe 10' RIB with a 15hp Merc 2-stroke which I used as a dive platform. This arrangement would transport two divers, two sets of dive gear and two extra tanks at around 17 to 18 knots which was great for getting quickly to and from distant dive spots.
The problem was while it also works great for to and from the dinghy dock and dinghy cruises the setup when not diving is a real mother, that Merc weighs 70lbs and it's big which also makes storage a challenge. So I did what you did I got a Honda 2.3hp 4-stoke. It's great, it's lightweight, stores easily in the port side cockpit locker, doesn't need pre-mix and easily gets us to the dock.