well I don't know what you did different then me, but I spent half the day and I could only get to 30, here is what I have done........
bored out the 90 and smoothed out the transitions and cut the washer for the 90
trimmed the output volute down
cut first row of pins off
4 layers of mesh
tired 3 venturis (the one you made did not work well on mine)
saned more of the volute on the intake side
here are my pics............
this is my venturi, its just a schedule 40 3/4 pipe with the insides sanded down with ridged tubing. I held it in by one wrap of electrical tape
It shows 28, but it has settled to 30 now
