I would think you need to open your high needle some more. It's true you can fly an OS out of the box, but contrary to what many people say, they take some time to break in. I've got about 4 gallons through my 1.20 and it's finally starting to make the power it should.

What does the manual say for recommended high needle setting? I would think closer to 2 or 2.25 turns open.