Hey wait! Are we comparing an AI (bench) with a TI forward seat, and Chris's svelte frame with Tony's linebacker physique?
I don't know the answer to Chris's question but these are VERY different animals...
I would guess that just sailing the balanced hull with no buried Amas is enough to move the COR back. Plus shifting your weight, as Tony suggested.
When we were trying to plane the TI3 this week, I was looking back at the beautiful new rudder thinking, "right now, this is the only thing keeping us from gaining a couple more knots out of this hull". Until we add foils, of course.
Chris - That 15 knot tack you described is one of the absolute best rides with the Hakas or deck. Especially if you can hold it for miles. (Normally, you would be taking a bath in the cockpit the whole time).