When shooting, I place a lot less importance on my feet; the rationale being that if I'm leaning around a wall, crouching by a port, shooting while walking/leaving/arriving then the position is going to dictate the location of my feet far more than ideally placing my left foot 6-8 inches in front of my right. I focus only on how far I'm leaning with my upper body, and presenting the same position from my mid-chest up which allows me consistent sight picture no matter what the rest of my body is doing.