Been fine tuning engine/transoms heights for different engine brands and different hull boats. That's shallow, medium deep and deep V hulls with fantastic results. Haven't done so on a tunnel hull boat, but if you want to follow these suggestions to put where you want to be and before engine jack plate is installed, do the following :
-Float boat and trim engine to be at 90? deg with respect to water level if it's a manual trim engine.
-Sit a mate up front to better balance combo.
-Go for a wot spin on flat no wind water cond with engine trimmed at 90 deg if counting with hydraulic trim.
-Once on plane at a straight water course, check if mate can pull head out transom and check at which lower leg height is water flow passing by ?
- If impossible doing so due to boat imbalance, have a boater ride side to rear of engine to check that cond.
-Need to dial an ideal engine height for water flow (red line) to skim right under small upper water deflector plate 1
-If water flow passes above small water deflector plate 1 will achieve water splashes over or out transom.
-Will need to raise engine till splashes disappears.
-Check if you can meet that condition by just sitting engine on transom or playing with different hole heights.
-If possible, don't need a jack plate, engine will work spotless.
-If jack plate is a must install, proceed as suggested above.
-Once sweet engine/transom height is dialed you should achieve a flat middle wake rear of engine
-Can go for a prop maximization from there if in need.
Note: Test under trial and error at different engine heights till opt height is matched, must not move trim out of 90 deg while on plane if counting with a hydraulic trim. Post results, fingers crossed.
Happy Boating
