two inch chamber depth is a Burley pipe for me. I'd get 60+ minutes on a bowl of Burley in a pipe that size. I'd smoke a pipe that size full of Va all evening, long past the point of enjoyment. Sounds like you are attacking the pipe instead of calmly sipping on it. Your tobacco is not delivering it's magic when it's burning hot and fast like that, so it sounds to me like you need to work on your technique til a slower pace becomes automatic instead of something you have to think about. You will enjoy your evening pipe more, your tobacco will taste much better, there is just no downside toward training yourself into a leisurely approach toward your pipe smoking. It will seem like work at first, but before you know it it will be automatic.