Are you flying inland or by the beach, swirly, gusty inland winds will cause the symptoms you're describing. If this is the case, you may have to
either try finding an alternative field or get used to using a little brake or aggressive flying to keep it off the edge of the window. I drive 45min
to get to a small park because the one 3 times the size that's 2 blocks from my house has horrible wind conditions.
One other thing that you can try is to tighten up the brake lines a bit, tie another knot on the brake line leaders to shorten them up an inch or two.
On some kites this will slow it down a little when it hits the edge of the window, on others it'll stall the kite and have it fall backwards. May be
worth a try. I haven't flown the new rads yet so I can't say for sure. The old Radsail was a nice stable kite though, can't imagine they've gone
backwards.
Sysmic S1 Buggy.
0.7m / 1.4m / 2.0m PKD Buster I
4.4m PKD Buster
10m JoJo RM+
6m Flysurfer Outlaw
12m Ozone Access