[Erik]

You are flirting with the End my friend. Easy to drown in a foot of water, in fact most people drown at the surface, so 'only' 30' is not rational. I'm not saying don't- it's not for anyone to tell you what to do. I solo dive almost exclusively, against better advice, so who am I to say?
But I try to think about the impact on other's before I go past my comfort zone. People blackout during 1 minute dives sometimes and others never experience one, no matter what they do. Your day will come when it comes, but you can still minimize the risk by being conservative... only you can say what 'conservative' means. Stay safe bro.
Cheers (despite the doom and gloom haha!),
Erik.