well since the engine has been tweaked for more power, the slipping might just be because you are putting way more torque HP to the prop then it can handle, basically spinning the tires of the rim, or in this case, spinning the prop out of the rubber hub.
going lower pitch will raise the rpms but it also reduces the needed torque applied to the hub to turn it, so that might be what is needed and just be careful not to over rev the engine
hope that makes sense
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