You should shift all the attention of lifting into finding the cause of and resolving the lower back issue. Minor back pain is a warning sign of a potentially developing problem that may pop into an excruciating condition at any time. I’ve done it.
However, what you can do is work like a dog on pull-ups and hang-ups. Back extensions are therapy for disc-issues. You should hang head-down for extended periods, like with an inversion table. And fix any bad postures, particularly sitting postures. You’re at last 1cm longer when you wake up than a couple hours later. That’s disc fluid. Yes, you can refill the discs by inversion, which also sucks bulging discs in and allows healing and repair. Of course not all back pain are disc issues. But testing these methods would give clear indication. Any pain would likely be relieved noticeably by inversion if you have a disc compression/bulging problem.