There was a suggestion on here that Prowaves were prone to this but I doubt it.
Check that your pressures are right. You need a gauge! Deck/keel pressures can be quite high, if you don't have them at the recommended pressure, it won't work - end of.
Water over the transom shouldn't be an issue, unless you're throwing shapes. It might be an engine trim issue or loading.
Check the pressure and trim and see how it goes...
I'm getting mine in the water tomorrow, first time this season - looking forward to it