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Plan out the cooks you are going to do and then cut it in half. Give yourself time to breathe, walk around and meet other Eggheads and try their food. If you plan too many cooks, you'll end up stressed and work yourself to death. Better to have a few, good quality cooks and enjoy your time.
Sounds like if you are opening your vents that much, you've got a block in airflow somewhere. Have you taken your egg completely apart and cleaned all the ash between the outer wall and firebox lately? Was your bottom grate severely blocked with small pieces of lump? Next low and slow, try taking all the lump out and then add fresh lump big pieces on the grate and smaller ones on top of that. Just a thought.