cmdubs said:
I can deadlift much more than I squat so not sure it lower back weakness is an issue. could it be a flexibility problem? I noticed my hamstrings are pretty tight when I tried some stretching excercises yesterday.
Well, that's good to hear and a positive statement nevertheless. Many believe the deadlift is a true measure of strength, so you're doing well in that respect. With squat, there is so much work to do when it comes to form and flexibility is important, but if you have no trouble reaching to pick up the weight for DL, your squat probably isn't hindered by flexibility (although it always helps). Lets talk about form and some additional exercises to strengthen the areas associated with the squat.
You would do well to read some of the training stickies here because there are a lot of sites to visit and articles to read which I have used and they are very good. That said, have you tried box squatting? It helps a lot with squat form and helping a person to practice staying tight and holding the arch while sitting your ass way back throughout. Stick it way out there...seriously. You may vary your grip on the bar (dictating the width of your arms) then try to pull your elbows 'down' toward the floor. This should bring your chest up. so now here you are...ass back, LB arch, elbows down, chest up, look straight ahead, toes pointed slightly outward and knees in line. Visualize you are spreading the floor apart with your feet when squatting down. This will help your knees fall 'outward' as you sit your ass back.
A lot of the work coming out from parallel is done by the hip flexors and glutes. It also goes without saying you need to have a strong core. Maybe try adding work for these weak areas. Glute/ham raises, pull-thrus, SLDL, Hypers (weighted [hold a plate] or with bands/barbell), standing ham curl.., heavy ab work (weighted pull-downs, etc.). Hope this gave you some things to think about. I really think you just need to spend more time on your accessory exercises to strengthen you weak areas in addition to your core lift exercises. Good Luck.