An amazing piece of work. Thank you for going to all the effort.Extrapolating from you graph, am I correct that 90% FPE occurs at 50% valve opening in most cases? Gippeto works on 1/2 bore volume for reservoir, but 1/4 of the bore area for his opening of the spool to reservoir. I understand what he is talking about with the "spool" bouncing recoiling to block off the airflow and he has come up with D/4 as a working solution.Is there any advantage is the spool moving back to open the reservoir 100% though?