Im 5'8'' about 195lbs. I just started squating heavy 240lbs and i do 5 sets at 8 5 5 3 3. During my squats my lower back starts hurting but goes away about 30 min after my workout. I believe my form is good i keep my back straight and do lower bar squats so the bar in on my shoulder blades. Should i continue or should i drop weight. Thanks for any infos