Hi, I have done 3 jumps out of plane. My arching wasn't worst but needed more improvements for stability.
So I have book AFF wind tunnel, and they have tough me to arch differently.
DZ tells me to keep hands wide apart, bent in elbows at 90 degrees.
https://images.app.goo.gl/SjKJAp6K43ALAJKY8
Wind tunnel tells me to keep my hands closer, slightly bent and relaxed.
https://images.app.goo.gl/vwGDPZsMySHFu58v5
I find my self more relaxed and stable in wind tunnel position.
So which tip should I do on my next jump?