I think training for depth in the squat is mostly about hams and glutes whereas the front squat blasts the quads. You should have a large variety of squats in your repertoire including front squats. But for depth, make sure you are doing accessory exercises like glute ham raises, stiff legged deads et al; as well as box squats and quite simply - back squats hams to calves.
I see lots of raw guys on my team ( won't name names, but a few guys totaling at or above 2000 raw) do front squats once in a great while.... but not for the purpose of stretching anything or hitting depth.
If you aren't hitting depth raw it's a form issue. No muscle is so tight that it won't let you hit depth, your singlet isn't too tight..... just form. Usually just bending over so far that your hips come up. If you post a video I can say for sure.... but 90% of the time its either: 1) you're afraid of the weight, so you're cutting it high..... solution: man up. 2) You are sitting back to far and putting the weight in your back. Because I train in gear 99% of the time I do this when I squat heavy raw...... solution: unlike a geared competitor who wants to sit back in to the suit and load the hips/gear. A raw squatter wants to drop the hips straighter down. It's harder on your knees but easier on hips and it lets you drive with your quads and hit depth easy. 3) you are too wide ( feet) or are bent over and your belly/belt/chest is hitting your knees, but your ass is up in the air way above //..... solution: keep your head UP and your chest UP...
I work front squats occasionally for two main reasons. One is to strength the quads. Two, and this is the big one for me, is to force me to keep my weight back and upright. In the past I've had issues with my weight trying to drift forward coming out of the hole on my really heavy squats. Working front squats forced me to sit back and not let my weight get forward at all. Put 405 on your shoulders on a front squat and try letting your weight drift forward just the slightest bit.. guarantee you're dumping the weight.
If u want a bigger squat stick with your box squats and standard squats...focus on depth every rep..Front squats will not help your squat go up.For me it more of a bb movement...Its a awesome exercize to build the lower tear drops.......Same as hack squats....dw