Looks like we have ppl with a different stance on this
The bar has equal lines, that's not the problem. I'm not sure about the huge throw tho, as kitexpert says, the 9m is a small kite which I'll use for HF.
Maybe, just maybe the yellow pulley lines on the kite are wrong length, since replaced who knows when. As I understand they do change length with time. I'll double check this.
From my short experience this Sonic is beautiful to fly. The bar input is decent, it's quite fast since only 9m. Loops faster than Edge 11m v7. Sure, not powered loops and done on the wind edge, still says a lot about the kite speed.
On the TT upwind front I'm a bit puzzled, maybe with a HF it will show its full performance. Again, that might be me choking the kite even with little sheeting.
With sheeting, the kite will go backwards hence the only option is to trim till it stops. I guess it's a constant operation with this and need to adapt.