I also keep my tension as loose as possible. Maybe I can do that because I use the zero-float SPD-SL cleats, (the red ones), so my feet don't "wiggle" side-to-side throughout a pedal rotation. Then, when I want to unclip, it just takes a little twist, and I'm free. I tried the float cleats that normally come with a set of pedals, (the yellow ones), and just hated them right off. Didn't even get half-way down the block before I went back home and put on zero-float cleats. To be fair, maybe the reason I've never had problems with clipless is that I've been riding so long and started out with the old "rat trap", toe clip/strap system.