edit: OH, SORRY. I MISSED YOUR POINT! You saw no change from stock to modified clamp plate to waist cut reed, right? Gee I don't know what's going on then. Maybe there is some distortion of the reed or a sideways twist or something on the reed with a bean hole in it.
Yea i dont know whats going on here either. tell ya what i will mail you a waist cut reed and you mail me the bean cut reed and we can each try these and see if we get the same reults again. I am wondering if it would be worthwhile for you to do your test again. I had done my reed valve twice and got two different results to.
Again in my first testing of test #7 reed valves
stock valve RPM 7050
modified reed valve 7410
rubber reed valve 7410
Second testing of test #7 reed valves
stock valve RPM 7410
modified reed valve 7410
rubber reed valve 7410
I have my suspicions as to why there is no change in performance.
At this rate i just cant see what a y manifold with a two reed set up would do.