lerpy
Contributor
More or less just going to repeat what has already been said, as you get more experience you will calm down, use less weight, hold buoyancy better and all those things that will allow you to relax your breathing and get better SAC rates. As Max Bottom Time said get someone to video you diving, this is a great idea as he said to see if you are moving a lot, sculling etc, as well it will give you an idea of your gear config. Sometimes you will see your get sticking out in places, that increases drag and can have an affect. At the end of the day you may be a heavy breather. I dive double 130's for tec and cave, and when I dive an AL80 on a trip in the islands I am there first one heading to the surface normally, much to the upset of my buddy, but that's life don't let it pressure you to run your air low.