[patrickt]

Listen to Bobcat on this. I'm at 31, orange cam with the screw in hole #1, with no stumble. I would concentrate on making sure your carb is set up as per his post, of course double check your float levels, check your pump arm clearance as per the vid, and clean everything (yes, air bleeds, down the vents, etc.), richen the mixture a bit and see what happens. Honestly, if it was in front of me and you told me that you had been drilling the nozzle yourself, I might just buy a new one for $20 just to make sure there wasn't a problem in there somehow.