[vinman]

Use a squat rack to work in a narrower range. You probably have a weak/ sticking point as the weight is coming up off and just before it gets to your quads. Use the bars on the squat rack to strengthen up you technique and your muscles in that range. I had a sticking point in my squats, so I went lighter and moved slower through the lower portion of the exercise. I did the same thing for my bench.