Belial, at least you're going as far as your body will let you, and it's below parallel, that's better than 90% of the guys at any gym I've ever trained at!
Now that's the spirit!! Long as you break that physical barrier, along with your knees and pelvis, you'll have something to be proud of........long after you're home from the hospital.
these seem to be the trend at my gym. muthas load up the bar with 8 plates total and do those .25 squats, straining in agony. shit, 1st of all, you gotta be able to support that weight standing up and be able to take a couple of steps with it. jeesus..
Going below parallel can be really beneficial but depending on how much weight is involved I would recomend a spotter for sure, I usually go below parallel only if Im using a Smith machine. The more you increase the weight the more you increase the risks of not being able to get it back up after you dip below parallel.
Power rack is best, not a hell of a lot a spotter can do if you can't get up. Smith machine squats really are not the same as a free bar. Gotta get under the free bar to truly squat.
I've gone up to 4 plates(405lbs) for sets of 5 ass to the floor, never found any use in the smith machines, I've always done them in the power rack with the pins set just below where the bar drops to during my reps, that way if I fail I just sit.