Changing the prop to improve your holeshot will always result in a lower top-end speed, unless some other possible adjustments are made, such as raising the motor height. But raising the motor should be done carefully, as @frugalangler also mentioned, to make sure there is no drop in water pressure on plane.
Although a different hull i still think you should see similar numbers
and is there a way for a laymen like myself to check the pitch. Thanks to all for the help.