I'm sure you would be happier with a 4 blade prop. If properly sized for your boat/ motor, it will give you better cruise efficiency at lower RPM, better grip in rough water, faster out of the hole (especially when loaded heavy), lower RPM to plane, and help to lift the stern.
Most of our fishing boats would benefit from a 4 blade due to their desired usage (mid-range cruising) and their tendency to be stern heavy. It has always surprised me that dealers almost always put 3 blades on coastal fishing boats. I think it's because they have been told by manufacturers that 3 blades are "versatile", that is they do most things "reasonably well". True enough, but I want my boat to do its job not reasonably well but as well as I can possibly make it, and to that end I have spent the time over some years and several boats to try to optimize the boat's performance for my desired usage (fishing and getting to the fishing grounds). Prop sizing is critical to a boat's performance, handling, and economy but is often overlooked. As an example, my latest boat was delivered to me with a prop that made it handle and feel like a dump truck. Some prop slip calculations showed the boat to be very inefficient so I spent a little time investigating and came up with a 4 blade design and size that I liked. Installing that prop transformed the boat. It now gets up on the water and cruises faster at 6-800 RPM less than before and is fun to drive. By the way, it is quite similar in size and weight to your boat.
A 4 blade may often cause you to lose 1-2 mph on top end but for those of us who just want to fish and cruise in a relatively heavy boat, they can have great benefit and save some fuel dollars.
Good luck with your search. Prop slip calculations are quite simple and can be found on the Internet (I'm betting that your prop is slipping 20-30% at cruise). There are also lots of online prop calculators that can help you zero in on the right prop.
OF
