I have a quite similar issue when I go with a small board (typically surffoil size board). The body is kind of jumping out of water when I increase power while I am still in the water.
Wondering if my boogie isn’t too light and would beneficit of having some weights added, if I should put the towing point lower or maybe change the motor angle as you said.
I changed from surfboard to bodyboard, used some images on here as a reference and it now works fine, but submarines a bit so needs some foam forward.
Try a bodyboard, make a trim tab, put the weight forward and to the left. This is by far the best first base I think for a single motor setup. (I tried small surfboard and small foil board)
My message was not clear, I make a bodyboard pretty similar to the one of hadou and it works fine but I would like to use a surffoil behind it currently I only manage to start with a wingboard. If I switch my wingboard for a surffoil (behind the same bodyboard) I have it jumping out of the water 
We are in much the same position then.
I think a combination of better technique and refining the balance of the weight position and maybe more trim. Share pictures and videos if you can.
Will do currently I only have this: https://photos.app.goo.gl/Z8CqCCB1DNL5rKZx8 this is my 10 years old son (35kgs). 
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FYI I move my tow bar below the boogie and now it stays in the water and I manage a couple of takeoff with a 38l board and 1000cm2 foil (my self being 88kg baked). Only remaining trouble is that when I accelerate I have some hickups (engine seems to stop for 1s and restart straight away) when I reach around 50% don’t happen every time but maybe 8 out of 10 starts. Suspecting some esc parameters like motor timing or demag compensation may help but not sure. Any feedback of course welcome.
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