I just can let it go without comment Wouter, although I didn't want to get into a long discussion with you on this topic and yet I am sure that what I am about to say will get a verbose reply from you.
You have stated that "wave making drag" is not of any major factor in circumstances as you have outlayed above, and that wetted surface area is far more critical! Well I am sorry to disagree, but from my own calculations based on figures and quite thorough practical testing conducted by C.J.Marjac, many years ago, when it comes to the practical application of drag factors for craft of small dimensions, of which can be included all of the sort of cats that we refer to roughly as "off the beach", wetted surface area produces such a minimal difference in drag between ANY/ALL of these sized cats as to not be of relative consequential variation to be used for the "static" calculations of differences in hull performances
Whereas there is a huge difference in drag (and therefore potentual performance) between cats with hulls of equal length, weight, and having the same "driving" power applied, but of different "wave making drag" design efficiency or lack there of. The practical "observations" of this are many and plain for all to see.