Speaking of corners - With a 200m track there will be more cornering and the center of gravity will be going less distance than on a 250 or 333. The low bottom bracket on the road bike is giving some of that back, maybe a couple of cm per lap but his seat height is taller so he gets more from the corners than a shorter rider.
On this basis I expect that the next sea level attempt will be at Alpenrose on a tall bike (double double diamond frame). Probably why Carlton is suddenly asking about pursuit schedules.