Your problem is the price we have to pay for the wide/short modern boards. Its a well known problem since the hypersonic.
Problemshouting:
1 Lower the boom
2 The mastfoot a bit forward
3 minimize the distance between the front and rearstrap (frontstrap backwards)
4 Smaller fin
5 A real stable sail when well powered up
6 Maximal downhaul
JJ
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