I would go back and check your entire pitot system again.
Mine was reading low, and like you, my stall was at 35 MPH. I replaced the entire pitot and AoA lines, from the D100 back to the Dynon pitot tube. Found a pretty good leak at the connection to the pitot tube. Problem solved.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC