RE: Engine and water spray, what to do?
Taxi with full up elevator. If you add 3 or 4 clicks of power your prop blast hitting the elevator will raise the nose. Higher nose-less spray. You will probably also notice that the plane weathervanes downwind when you do this . You can steer with the throttle. Less: weathervane upwind. More: Weathervane downwind.
Spray deflectors are another handy mod you can do to your plane. 1/4" wide rails at the edge of the bottom, angled down 30-45 degrees. When the spray scooting out the side of your hull hits the deflector, it will be pushed down. Inerestingly enough, this adds to the lifting force of the hull and gets you up on step more quickly.