Yeah i have notice sometimes when there is a lot of air i do take more air than needed but i have tried using less and its all about becoming more calm and feeling like home down there.. Just focusing in what your looking for in between layers that could have potential gold. I dont have a regulator. I have plurge valve from a snorkel.. I connect the air where the snorkel tube goes and thats my regulator. All extra air goes by the plurge valve and wheb i breath the valve closes & no water goes in. No forcing on the lung or having to feel like in sucking air like if it was a straw. . I have never used a second stage regulator it probably just save you sone more air in the tank idk .. Like i said i never used one.