I have a pretty wide stance with my toes flared out. It might be because I have flat feet and am almost 6'1" but when I have a narrow stance I just can't squat properly, I'll lean too far over and just won't have any stability.
I'm 6'1 as well and have to use a wider stance (more than shoulder width and toes somewhat pointed outwards).I also use a *gasp* board under my heels. This way I can stay upright in my front squats and hit my quads.
I need to work on my hamstring and hip flexor flexibility. Isn't the same it used to be many years ago.