So twice I've had notes in the first octave that start breaking into the next ocatave, (G1, F#1, D1). And twice I've fixed it by going after the reed. After playing the reed for 15 minutes, I take it off and shave down the table. I also hit the middle of the reed on the flat side where it could bulge a bit. This is simple and may be useful for this problem. Anyone else experienced this?