F161 setup

[Timothy]

Hi,

with my new F161 I have some problems.
In non planning condition, the nose is diving, I have to go far back, this is not a very comfortable stance.
I have to tack very quickly.
To get planning, the boom must be very high, I get problems to get out of the harness in low wind conditions.
I need 10-12kn to get planning with pumping and I must go about 90° from the wind.
If I get planning, everything is ok, stance is very comfortable. With my old formula everything was very easy.
So I think I do something wrong, or the setup of the board is not ok.
I'm 1,90m and 112kg, sailing on an lake.
The sail is a GUN Mega XR 11,8m².
The fin is a Drake R19 700 NR +8.
Can anybody advice the correct setup for the board, boom height, mast position?
Thanks for reply. Timothy