My son is a guzzler, and sucks down heaps of air, gets upset, latches on like a machine (not necessarily well though) and so has struggled with gas, fatigue etc. I also have one very sore boob.
I feel guilty as I've found that all of these problems are solved by feeding him expressed milk. He gets a good amount, doesn't get upset, burps and settles well.
I'm aware of the issue that he may reject the boob, so I don't do it every feed. So far it's working really well but I feel guilty! Am I over thinking it or really taking the slack option....