I use a #3 reed now because when I used a #2 I would be flat to the point where I my mouthpiece was as far down the cork that it wouldn’t go any further and I’d still be flat. When I switched up to a #3 it was hard at first because my mouth was so tired. Then I learned how to file down the reeds and am happier with better tone and don’t have to push the mouthpiece so far down the cork now.