Is that not one of the advantages of 50 deg seats? Less low lift flow but more high lift flow. Maybe the intake duration can be increased a little due to the this? That's not the real reason I started playing with it though. I saw the 50 degree seat as 5 degrees less of a turn on the short side and 5 degrees less of a combustion chamber trough for the air to climb out of on the long side. The 5 degree steeper top cut also creates a natural anti-reversion dam on the short side during high lift flow separation - as much as 5-7 cfm gain in my testing.