If your AV plate height is correct, 5200 is too low! Most dealers seem to mount the motors too low, so check that first, but
OPTIMUM WOT rpm for your motor is 5500-5750, so I'd be thinking about trying a 17" pitch prop. Also check your min planing speed, because it's nice to be able to slow down and hang on plane at about 12 mph if you're running offshore and the seas get over 3'! A lower pitch prop with more blade area and stern lift will typically help you do that.