Due to the hull design springers will always dive, this is one of the reasons you put a coaming around the hull opening for the superstructure. On full power one of mine will have about 25mm of water rushing over its decks, but no water inside. If you move your batteries towards the back so the springer has a slightly nose up attitude, it will help but not stop the problem. I have tried putting a bulwark between the pusher knees, but I felt it trapped the water and made the probelm worse so removed it.
As long as you deck openings are water tight there is not a problem, unless the water washes off your deck fittings.
Brian