Justin, d-Nasty would be a good example of the change you need. You have to go to a 4 or 5 blade prop and probably a 17 or 18 pitch. Many places that will sell you a prop will let you try it and exchange it for another until you find the best one. I'm a big fan of stainless steel over aluminum.
When you get a lower pitch prop you will be able to hold speed better and will use less gas while boarding. You do have to worry about WOT running as it might over rev the engine when you are unloaded. Just pay attention. You can always change back to your current prop if you are going cruising, but you probably won't.
I would strongly recommend getting a hydrofoil for the leg of your sterndrive. Nothing will get the bow down better. It will also help you maintain speed for wakeboarding much better. I've used one of the original Stingray foils on an I/O for many years and its the cheapest performance upgrade you can get.
There are other brands that will also help.