My 6 m2 LEI (Takoon Furia 2017) is really pleasant and well behaved, not a "small kite" as such.
My 5 m2 is still okay, but a bit more sensitive.
Being a wavekite though, it is made to be well behaved.
Smaller than this, I have found, on the two I've tried, that it gets more "jiffy" somehow in terms of on/off, or it could like I wrote, be something with the pure wind speed you ride in, that makes it even worse if not spot on.
One thing that helped immensely, was to use normal 25-27 meter lines on the smallest kites (instead of shorter lines like we often do when surfboards) - this evened out the on/off feel
Have no idea about small foilkites today - except for many years ago open cell 3 and 4 m2 foilkites, they had loads of power in extreme powerspikes like nothing you had ever tried, but this is not what many of us seek in hydrofoiling - only in marginal or lighter winds.
In 23 knots I can still ride my 5 m2, but it is not good, too much for the sweetspot and carving/waveriding even with smallest (wave) wing, and at 24 knots it is no good at all and I can forget using it in this wind - in fact I will be about to go out on a surfboard with the 5 in that much wind, at least on the verge changing from 6 down to 5 m2.
Things happens very fast in this end of the wind, also on surfboards, regarding sweetspot size.
But interestingly, on surfboards with these small kites, they dont feel odd the same way at all - I think it is because we ride them more powered so more bar pressure thus easier to control the short stroke, and of course also because the surfboards never accelerate too fast with the wind, like a hydrofoil in high winds and waves.
PS: Remember, this is average wind we are talking about - many seems to overestimate the actual wind. But as it fits pretty well on Pedro's experiences, I hope my input could have some value - eventhough I know many write they ride way bigger kites yes, and a very different situation then.
PF