As other posters have stated, check the props, the Honda high thrust props are four bladed. Incorrect props will tend to make a hole in the water
Also check to see that there is no electric
tilt or long bottom bracket. My Yammie 25 is electric
tilt and 25 inch which sounds fine but the bracket containing the hydraulics is huge, about 100mm deeper than the non hydraulic bracket of the Honda 25. What this means is that the motor
has to be lifted up 100 to clear the bottom of the nacelle. (In my new installation I totally removed the whole bracket and made a short composite fitting for my new nacelles.) (A cat with twin 25 Hondas with vertical tracks to retrieve engines had a huge electric tilt bracket, even though the motors never tilt, to get electric start. Still, a composite bracket based on the pivot pin would have solved
scooping problem it had)
So check the Honda does not have electric tilt. They may have come with the electric start. If the do have electric tilt the engines will be about 100mm higher than the Yammie and ventilate a lot. 100mm makes a huge difference. When I made my new nacelles I had them ventilate a few times too many. I pulled them back into the shed and dropped them 70mm. Now they almost never ventilate.