Even with the stock prop the UL-1 will submarine off the beach if you are too gentle with the throttle. Usually giving it full throttle until it pops up works well. But if the strut is too deep or has too much down angle at the prop end it can be very difficult to get on step. A lifting prop like the one you used can make the problem worse, but it can be worked around. The air dam is just to help keep the hydro from blowing off at top speed.
Each UL-1 setup will be a little different due to battery weight, etc. but try the bottom of the strut 7/8" below the bottom and dead flat. Set the boat on a flat table to set the strut depth and angle. This is a good place to start, running the strut too deep upsets the aoa of the boat and spills too much air causing side-to-side rocking. We have one UL-1 in the club which is ballistic, it runs flat and very fast. You do not slow a hydro down much or it falls off step and drags badly. That will damage your motor, ESC and battery by heating them up. Run the hydro like it's supposed to be run - full throttle most of the time. Extensive part throttle running is bad for the ESC. Welcome to the FE side! We have watts.
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