are you getting them shaving sharp? no or little blood almost sounds like a head not as sharp as it could be
a broadhead of any kind through the lungs is gonna put one down fairly quickly, with that said i had a friend say the same thing you are saying, after 2 lost deer,with what he said were good hits, he hammered the remaining ones flat and went back to a 2 blade. i am not sure he was getting them razor sharp eventhough he said he was. but since going back to a 2 blade he has done well. that is a mid 50lb wt long bow 600 gr arrows.. i believe there are 2 degrees of sharp one is shaving and feels sharp enough the other is a truely scalpel sharp edge the later will cut alot more that the other brushed by