How about you tell us how port velocity changes during piston travel vs valve opening? Surely you have a formula for that too.....
I'm sure both are very low on the "average" engine builders priority list too.....
Anytime you have both valves open after combustion has taken place means you'll have reversion. How much you have and how you mitigate it are a different discussion altogether. If the cylinder isn't filling it isn't making power.