A well made (ie stiff enough) wing mast like a capricorn is better then the T section.

As for adding wings, I think that with a low drag hull you wouldn't need the wings and in fact they would only add to the complexity and increase drag.

Kings Cup boat was a lot slower than any of my normal boats. But when you get paid to sail you dont get so much choice. The boat was a DK46, we sail one in Australia often so it was pretty easy to get on and make it go. Very close competition from 2 TP52's and Neil Prydes Modified farr 52.