I have the same boat yr and all- I have 17 x 17 3 blade props- tops out at 43 mph- and loves to run at 3200 rpm @ 28.5 and if conditions are right its approx. 29.5 MPH
SWIM PLATFORM.COM has the best unit- I put one on my 330DA over the integrated- remove the add on. It will be the best add on you will ever do. They will deliver to your door.