Identifying your lower back as a weak point in the squat is pretty key (I'm thinking dedicating some effort to goodmornings here). Knowing where and why you fail on the bench is something else good to know.
Anyway, one option for extending a run a bit is to decrease volume and accessory work and/or lower the target reps (maybe 2x3 or 1x3) and push on that for a couple more weeks. That's an option that's given people a bit of breathing room. That said, you just canned the squat and are worried about weak links like the lower back. I'd sit back and reflect. Set up a program and begin again. Maybe that's a WSB template, maybe that's another "5x5" but with different reps range or a tad more work at the top end i.e. 2 or 3 sets of 5 with top weight which will give you more work with heavier weight and probably build some better core conditioning. I'd certainly look at goodmornings and even making them a core emphasis. You could also try changing the rep ranges to 3, 8, 10 or whatever. There's a lot of ways you can go, you're essentially a white canvas with some basic shape tracings on it, what you decide to make of it is up to you.
Anyway, one option for extending a run a bit is to decrease volume and accessory work and/or lower the target reps (maybe 2x3 or 1x3) and push on that for a couple more weeks. That's an option that's given people a bit of breathing room. That said, you just canned the squat and are worried about weak links like the lower back. I'd sit back and reflect. Set up a program and begin again. Maybe that's a WSB template, maybe that's another "5x5" but with different reps range or a tad more work at the top end i.e. 2 or 3 sets of 5 with top weight which will give you more work with heavier weight and probably build some better core conditioning. I'd certainly look at goodmornings and even making them a core emphasis. You could also try changing the rep ranges to 3, 8, 10 or whatever. There's a lot of ways you can go, you're essentially a white canvas with some basic shape tracings on it, what you decide to make of it is up to you.