30 Knots spin out ... Help!

[docgr]

Hi everyone,

I-sonic 111 with a 7.1 Point7 AC0 - 38 Drake fin
I-sonic 86 with a 6.2 NP RS slalom - 32 Drake fin

Tried several times, but every time i approach 30 knots always ... always spin out (29,77 spinout ... 29,50 ... and so) both with te 111 and this morning with good wind and the 86.

Ok, I'm going to buy SL4 fins ... but ... is there something else about the trimming that I can do? .. Seems so strange to get 28 ... 29 ... apparently without problem and then .... ooops the board always start sliding ...

Quite a newbe i speed matters .. of course

Thanks for any advice

Giorgio