Blaster Which Blaster Impeller

New to Blasters. My set-up is a 62t engine with MSD enhancer running dual38's, a/m arrestors, Riva head 35 domes, Factory mani and JetPro pipe, top loader grate, and Riva Groovy plate. Mostly flat water and wake jumping, but also Lake Michigan riding.

I have the stock 15/18, Skat 15/20, and Skat 13/16. I'm thinking 13/16 but is that enough. Any suggestions appreciated.
 
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