so true my lower back started to revolt on me a few months ago. i would highly suggest that you give your lower back adequate rest and not fall into the trap of frequent heavy sqautting because "it's the only way to get big" yea the squat is badass and i will always do it, but i feel that tnation folks (myslef included) push heavy squats so much that it's ingrained in us that if we don't squat heavy for a few legs sessions that we will lose progress, strength, size or an ego boost of pushing heavy weight.
i am suffering the consequences of not paying attention to my body and thinking i could over come a nagging (turned chronic lower back/QL/Psoas/ every fucking muscle in the general region problem). I went from squatting a consistent 275x12x4 to now barely being able to do bodyweight (160) without feeling a twinge. however, since i have to use light weight it has given me a chance to really focus on trying different stances and approaches to the movement. I found out that i was really using my lower back more than anything to move the weight because I pushed my butt back so much. Advice from skip hill that i have internalized is don't let your ass get away from you. meaning keep it back but not so far that it turns into a butchered good morning. rememeber if you're not getting at least a little quad pump from any type of squat it's probably because you're letting you ass get too far from you and your lower back is doing the majority of the work.
this is all based on personal experience so others might and probably will disagree with me. but i have to believe that there are some in my exact situation (whether they read this or not idk).
just some advice, take or leave it.