if you havnt done high rep leg work you are missing out, separates the men from the boys.... for me personaly, anything under 10/12 reps is too low, as u can force the weight from a to b with legs and still not feel it how you should
i could add another 4 plates each side of the leg press and do full range presses for 8 or so reps, and the only place id feel it is my hips, but when u do a slow, sqeezing 20+ set its somthing else completely