Hmmmm possibly, but the thing about a t foil (unlike many things) is that even one which is not so good is loads better than not having one.
The optimal section of the T foil is dictated by the speed you go upwind (more=thinner), how heavy you are (more=fatter), and how far you can get back (more=fatter). The fatter you go, the more drag you will have when you are not using it.
The optimal vertical position is determined by the displacement of the boat (more disp=higher foil), and the speed the boat goes upwind (/sqrt (lwl)) This is why i14s have them so high, as they go slower upwind (/sqrt(lwl)) than us and weigh vastly more.
I think the message is that cherubs are all light and fast, and unless you think your optimal route upwind is more footed off than other people, then you probably want a similar section to everyone else.
The issue of the Dog needing more control may be important and may indicate a symmetric section with a control system which allows for lots of downpull as well as uplift.