1. I would lay off pretty much all quad work at this point, with the exception of straight leg raises.
2. Stretch, stretch, and then stretch again. Quads, hip flexors, calves, glutes. Anything that is tight.
3. More posterior chain work. Incorporate it into your warm-up, and your workouts.
4. Ice your knees after every workout. 15-20 minutes (but don't give yourself frostbite).
Give it a month or more ... see how it is, and let me know ...
