first with sonntag gps 6 30 cm too big for me on the gust. Then I changed to sonntag gps 4 28 and I went better. More control. I started with 4 kg then I put 2 more Kg.
I also tried isonic 70 (50 wide). I get my best vmax (34,07) but less 250 anv avarage speed.
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