The 2.08 properly un-shrouded will flow more at low lift than a 2.02. Listen to what you are saying, by your reasoning a .250 in diameter valve will flow more at low lift than a 6 inch valve. The bigger valve will flow more at low lift up to the point the port stalls, the port will stall at a lower lift with a bigger valve. The bigger valve has more open area around the valve at lower lift, port velocity will actually increase with the larger valve because more air will be flowing through the same size port

When some one claims there 2.02 valve J-heads went slower than when they had 1.88s and "no other change" you can count on it being because the chamber and throat were not opened up properly.