Re: air flow ?
 

Rod,
You simplified it by saying "some additional flow"
look at the real issue. cylinder filling
If the lift maxes at .500 and that is Max flow how many degrees of crank rotation takes place while it is at full .500 lift/max flow?
Lift it past the max flow at .500 lift and tell me how many degrees of crank rotation is at or near max flow. It aids cylinder filling.