I dont have much advice, all I can tell you is that I have some sort of hip problem, and if I dont REALLY warm up alot before I lift, I have problems. I also have to squat slowly, and only increase the weight a few pounds at a time. I will squat 295 until I can do three sets of 8, and then I will move to 300 and just do three sets of 4, then just slowly move to higher sets from one workout to the next. If I dont do it this way, I have bad hip problems, I have also found that if I am doing a lot of
high intensity cardio that I will have hip problems during squat no matter what I do.
So even though our problems are different, maybe that will give you some ideas to work with.