I have finally been able to get 15' off at 34mph working for me most of the time and am now getting 22' off with some regularity. I have only made 28' off once and that was with a strong head wind.
The last few times at 28' off I have been struggling with timing. I try and make the most of the gate but seem to always be ready to turn well before getting to 1-ball. If I try to go around 1, I often get slack. I think my width is good enough, but maybe that's the problem.