I have ran a .009 with my H30/31 PICT carb (cousin to the 34 PICT 3) and had a flat spot. I was timing that dizzy at 30 degrees. Usual range is 28-32 degrees....for me 28 was too low and 32 too high. Be sure when you time this you are running at > 3000 RPM.
I have since then switched to a SVDA (mech and vacuum) and that eliminated the flat spot all together. You time this carb the same way you would time a .009. Since I rebuilt my engine I now am timed at 28 degrees and getting better mpg (28-30 mpg depending on stop/go or freeway).