I know Peter Lynn sr did quite a few tests. Getting low wind flight, gust absorption and depower at high winds is apparently quite difficult. And then there is the simple but difficult problem of single line kite stability in a big wind range.
Seeing that a talented kite designer like PL was not able to solve this in his career thus far (or at least not that Im aware of), we could conclude that the problem is hard or impossible to solve.
Which leaves us with a kite that is of use in a limited wind range only.
Again, crosswind flight and active control would be some easy ways around the problem. But it seems most people dobt want active control (for good reasons), and without that, crosswind motion is so much more difficult to achieve for a lifter type kite.
Anyways, I could suggest an alternative lifter with higher windrange: A smallish kite on top, then a ring with three bridled kites much like @Rodread ‘s Daisy. Add a means to depower the rings (eg a simple servo driven AoA control). And voila!