My legs were so weak when i first started and i massively neglected hamstrings. When i started adding SLDL's, and hamstring curls my squat flew up. I also find lunges are amazing, though i hate doing...
I just did legs this morning, now time for a day of limping about at work :D You almost have a bodyweight bench for 10 reps... Thats not bad! Your lifts will come up hella fast now your bulking...