I agree with the 4B prop suggestions for more stern lift; some 3 blade props with lots of blade area, like the Merc Mirage and the BRP Rebel also have good stern lift that will help you hang on plane at low speed. There are a couple more things I'd check before you get too deep into changing props:
1. Make sure your tach is accurate. The digital tachs on the new motors that tie into the engine computer to get rpm are dead nuts accurate, but some analog tachs are notoriously inaccurate and they often read too low. Although not likely, your speed could be low because your motor is actually over revving and you need a prop with more pitch!
2. Make sure your motor height is correct. The AV (Anti Ventilation) plate should be above the water when you're up on plane and fully trimmed out, which generally means it's at least an inch or so above the keel. Some props like the Stiletto like to run even higher than that.
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