This isn't really knowledge but, apparently the 33's are test platforms and they are trying every type of foil they can think of on them. even the 72's have 2 different foils often.
from the photos it looks like the curved part of the foil is mostly in the hull when in the down position. the business end is an "L". the cant of the "L" is something to play with as are the tip foils shape/angle, etc.
Rudders have similar aspects to play with as well. it seems to me that an end plate on a daggerboard would help quite a bit to windward as well as become a hydro-foil off the wind. finding a happy medium between these 2 points of sail and the characteristics of the end plate would be a job, and require all sorts of testing.

there is some debate as to whether the extreme fineness ratio of the 72's may be fast enough to eliminate the need to fully foil in an upwind/downwind course with some 1-2 minute legs.