I recently purchased a used J12 Carolina skiff to use on the rivers in Michigan. It has a 2008 Nissan 15hp 4 stroke outboard. With just me (250lbs) it will plane and run around 20 mph but has the typical porposing. When I add another at 170 it won't plane at all. The motor has the standard pitch prop (9.25x9). I've read some of the past posts about the smart tabs and 4 blade prop. I'm going to try the prop first, just wanted some input about staying with the same pitch or dropping down to 8 with the new 4 blade. Thanks in advance for sharing your experiences.