Are you doing any assistance work (good mornings, hyperextentions, etc.)? These will help strengthen the lower posterior chain.
Also VERY IMPORTANT! You know your body best. It is important to know the difference between soreness and injury. If your the least bit suspicious of injury, I would advise you to at least knock it off for a week or so. Better yet, see somebody.
Bogdan Petia Sarac - Must keel moose and squirrel
Cancer Survivor - 7/21/10
Benchmark 5K time: 27:45 (3/5/11)
It's not the weight we move, but the people we move that matters. -- Bearded Beast of Duloc (12/31/10)