Need prop advice!!

Just put a xscream SS 900cc with a factory B-pipe and dual 44's in my gen 2 BOB hull. I put a 13/18 solas prop in it and am getting good pop off a die start but after that I have no power. Motor revs up but no pull to it. Any advice on a different pitch prop? Running a stock 144 pump with a mag stator section.
 
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