You cannot directly compare pitch between different impeller companies. They all measure pitch differently. Different blade shapes and designs also make even identically pitched impellers perform differently.
Sure. The 13/18 and 14/19 and 12/20 suggestions I have been told to try have all referred to Skat impellers. And obviously you and I earlier in the thread talked about a 10/16 Hooker.
If your current setup is best once the ski is moving, it is a little over loaded. First bore the nozzle, then take a hammer to the trailing edges and raise them 3/16". It will pull as well as anything you can buy.
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