Doing squats (and, if necessary, additional mobility work) will increase your flexibility.
Doing light / BW / goblet squats is very low risk, and will help iron out your form.
My point is that if your form is crap, and you're using any added load, then you're going too heavy. If your form is crap at BW (and adding a modest load, 45-95# for most trainees) doesn't iron that out (sometimes a bit of "bar discipline" does help sort out form), then, yes, work on form.
My experience is that you want to eliminate the obvious and simple stuff first (Occam's Razor), and that for most trainees I've seen, starting with simple cues and light weights addresses form issues sufficiently. KISS.
Doing light / BW / goblet squats is very low risk, and will help iron out your form.
My point is that if your form is crap, and you're using any added load, then you're going too heavy. If your form is crap at BW (and adding a modest load, 45-95# for most trainees) doesn't iron that out (sometimes a bit of "bar discipline" does help sort out form), then, yes, work on form.
My experience is that you want to eliminate the obvious and simple stuff first (Occam's Razor), and that for most trainees I've seen, starting with simple cues and light weights addresses form issues sufficiently. KISS.