Due to various lingering injuries, form issues and anatomical anomalies I've completely switched from low bar to front squats. I'm not ideally proportioned for this exercise, as I frequently have people comment on my form and the amount of forward lean I use. After learning how to squat Rippetoe-style and many months of squatting like this, re-learning the 'standing leg press' and taking my ass
out of the equation has been challenging.
I can do a tight, knees way beyond the toes and below parallel front squat with a reasonably vertical back, but I feel excessive pressure on my knees, and constant tension on my quadriceps. I prefer to go ass to grass, but due to antropometry, knee pathology and uncontrollable, instinctive hip drive this results in my ass shooting up and a 45 degree (estimation) forward lean. I have flexible shoulders and no issues keeping my elbows pointed up (well, up in relation to my back) so even with my 'excessive' forward lean my wrists never hurt and I'm not in danger of losing the bar. Nor do I lose tightness in my abs or lower back.
I'm getting a little tired of people (generally people who don't squat at all!) commenting on my form and warning me that I'm ruining my back, but I do take their comments seriously if there's any merit to it. It's just hard for me to judge if there is any.
So here are my questions:
1) what is considered acceptable forward lean in a front squat?
2) does the position of the bar across the front deltoids in combination with forward lean pose a greater risk of injuring the back, than the bar across the traps or in the low par position (given same amount of forward lean)?
3) what is the best way to keep your upper back safe during a front squat (with clean grip), is it by pushing your elbows in and spreading your lats, or by pushing your elbows out and squeezing them together?
Thank you for any insight.