later on I re checked how straight the hull is. I was wrong, the planning surfaces are not straight as i wrongly said earlier.....In fact there are some hook in the whole planning surface, worst area located pretty close to the transom.
I don't know is it due to tired mould, wrong way of storage or another design feature.
Anyway decided to take it a way. I filled it with lightweight epoxy filler, guess as worst it was like a 3-4 mm hook. I did only the flat surfaces, spray rails left undone at this stage.
Result was interesting. Wot/ high speed handling is better, reduced tendency for chine walking. Also the propeller grip seams to be better. But lost top speed about 0,8 knots, now slightly less than 39. RPM is about the same, 5500(not 100% sure but think it was close to that also before)
I guess loss of wot speed is due to the engine is kind of "lower" (rig doing more resistance than before) as the water now goes straight, as in the past it was directed "down" due to the hook.
Will lift the engine a hole or two to check how that will work. Will let You know the results.
fun on a boat is inversely proportional to size...sort of anyway