Like Dave said...the pump you get doesn't mean that they will grow OR get stronger!
For insane leg pains and growth...I like to try and do 2 sets of breathing front squats...20 reps each. They kill my quads like nothing else and they are usually jumping up and down on their own as I'm trying to complete my 2nd set.
Breathing hack squats are OK too.
You can always try and do some reps into your routine. You could go for something like 85 x 30, 95 x 25, 105 x 20, 115 x 20, 125 x 20, 135 x 20. I don't think that you will complete it though. The weights aren't important as the reps and the intensity. A 20 rep set should take 2-3 minutes to complete.
A couple years ago I was working with a guy who had never squatted before and had VERY skinny legs. At week 1 he failed with a horrilbe 132 squat and by the end of 6 weeks he got 20+ with it. (He also got bigger and leaner)