A few more degrees, and I think I could call it my "Fred Flintstone" stance. Not sure if this is because it's genetic, structural, or just out of habit. Great for dead lifting, not so hot for driving forward.
In order to get max power for punches and keeping your weight centered so you can move around more easily, the feet need to look like this:
Seems like a minor detail, but it's an important one. As I get tired, my right toe starts to drift back out which means I end up using the right leg to push off of more for punches. The extra stress really became apparent one night when we start throwing knees and my right calf muscle was cramping pretty much the next day.
Just for kicks and grins, I tried keeping the feet parallel for the kick during the breaststroke, too: didn't notice much of a change in power, it's just "different".
It still feels weird, but it's becoming less so. On the plus side, my calves are no longer killing me on the day after a heavy bag workout so I think this is having an effect.