[EdZ]

I forgot to ask.. Does this mean that his sweetspot is high on the clubface?

Part of the reason, according to Tom Wishon, that many drivers have better results higher up on the face is that many/most are still designed with bulge and roll in the face (a curved surface). This results in the upper part of the face producing a higher launch angle, which when combined with the fact that most folks are not using enough loft on the driver, tends to produce better trajectory and distance than a 'center' face contact.