Newer Egghead here. I've noticed that after several cooks, a lot of ash/little pieces collect at the bottom of the egg and prohibit airflow enough so that I can't get it up to 450+ and sometimes makes it very hard to get a fire going. I always have to clean it out fully and add all new lump.
Are you guys doing a full exchange of lump each time you cook? After 3-4 cooks? Are you only putting in large chunks?
Any tips/advice would be appreciated.