heels 17-18" apart. 35 degree toe flare
7" apart? That is a JOKE. Try squatting like that. Your range of motion will be nill. Your osteopath doesn't know jack about lifting bro. I do full squat reps with 265, but using the 7" stance I can only get about 3-4" above parallel and I could probably do reps with 405 that way. Not necessarily better because I'd be losing the whole bottom half of the squat.
If i was gonna go REAL heavy with max weights my total goal then I would squat like a powerlifter with probably a 30-40" stance with 35-45 degree toe flare.
And since my ass is starting to develope some shape to it when unflexed, I think I'll keep my full squats up haha.