Gero,
Interesting that you should mention lifting hulls.
Two things to note:
I believe John P has mentioned on the forum that the T foils dampened the affect of gusts lifting hulls upwind.
So in gusty conditions they made the boat more stable giving greater acceleration from the gusts as well as the additional affects of stabilizing the pitching motion allowing the sails to generate more power.

Someone using Darryl's T foils was telling me at a regatta that he was lifting the windward hull downwind and then moving a little further aft and resting the windward hull back down on the windward foil with the hull remaining clear of the water.
This allowed a slight bias in the downward loading of the hull making the boat more stable while still flying the windward hull. So he could keep the hull up in marginal conditions reducing the wetted surface drag as well as being able to drive the boat better with the added stability.

I think we still need to do a bit more experimenting, even so I expect T foils will find a permanent place in all progressive catamaran classes in time.

Now the next step could be independent adjustment of foils to help lift the windward hull in light conditions.
Interesting thought that would be fun to play with but unlikely it could be made simple enough to not cost more time through poor adjustment than gained.

But you never know until you give it a go.

Regards,
Phill