Doesn't work.

We have little daggerboard in the water but this is because you don't need much. When you turn, you aren't trying to turn a 16ft hull that is in the water hence very small amount of vertical foil in the water.

But as for leeward heel being bad, the foils will lift you in the direction of the heel. So if you are heeled to leeward, then when you start foiling they lift more to leeward and on the moth no amount of hiking can counteract this as the foil forces are too high. You have to drop the mainsheet and get the boat flat and then try again being flat or slight to windward. It is a classic newbie moth mistake.

So if you are going to try a t-foil on a cat, the boat has to be sailed flat. But how to get power to foil? The Canadian c-class guys tried all this and brought in Veal but couldn't get it going faster than normal c-class.

J or S foil on each hull a better solution I think.