The next best low wind alternative to hydrofoil would be the race board.
Agree, ranked in "light wind" order, IMO, taking some typical of these :
4. Door type board and big skimboard and small finned freeraceboard.
5. Flat Fish type wave board.
Then there is a middle zone, like
Standard TT, a bit wider/bigger.
Light wind waveboard, flat and wider.
And the "bad" ones regarding light wind, are
True waveboards, lots of rocker and curves.
Wakestyle boards with heavy rocker.
When you look at it now - it is apparent that the more fun, the worse it is for light wind
Just my take on this.