After running my Dirkach number 19 at Stuttgart I found it to be too high out of the water. This was cured by adding some trim on the back of the hull. Plus I put on a small wedge opposite the shaft to allow for running a 5470 prop. The boat as it is in the photo was run at a rough water race and handled really well and I can recommend you put the filler on the back as this hull runs best when it is flatter on the water.

Ian