Okay, so I've really been making an effort lately to get my form down on squats, and now that I feel I have done that, I'm starting to up the weight. I've started using the enclosed rack (not sure the name for it exactly) and put the moveable safety arms just below my shoulders at the lowest point my dip. I am going very deep with my squats (exactly parallel, maybe 2-3 degrees lower) and they feel GREAT. Using a slightly shoulder width stance with toes about 15 degrees duck out. I noticed my knees have a tendancy to buckle inward under heavy weight, so I've been working on keeping that issue under control. My question is, when I am at the very bottom of my squat towards the last reps of my final set, I ALWAYS get stuck at the bottom and fail. It happens everytime, and it's not a huge deal because I take the proper safety precautions, but is this a healthy way to train? Should I up the weight until 8 reps is easy enough to do heavier at a guaranteed 6, or am I doing alright? (I usually get 4-6 reps during my final set, usually 4 sets total) I'm not sure if this is too vague or if my question is clear enough, but this is the only exercise that I consistantly fail on during the last set and I'm just wondering what advice you guys can give me.