40" DM accuracy

[brandoracing]

Hi guy
In this time I finished my third flowbench,for go-kart tuners.
He need low power but big accuracy.
I made some test before take the bench to that man,but I have some problem.
Because my smallest plate are the 1.180" I put it into the bench and set ON TOP of the bench an audio compact disc...
This is my idea to have a new type of PAP.
here the results:

DEPRESSION 2.504 PLATE CFM 1,108 PLATE CFM
10 12,20 16,00
15 15,30 19,60
20 18,70 22,50
25 21,30 25,00
30 28,10 27,60

THIS DIFFERENCE for me are very important. exist a setting to made the best precision?
exist a plate smallest then the 1,180?