Went diving today with a friend at a quarry. We mostly were between 15-20 feet and the dive lasted about 40-45. When we finished I had 300PSI left and my buddy had 1600 psi left. I was almost embarrassed. Are they just really good or do I suck at breathing? I do have slight asthma but use my inhaler before diving. We were both diving with Aqualung Legends.