Last October I strained my back while lifting. It seemed to heal up pretty well, but early this past March I hurt it again--and this time, it was really my own stupid fault. I felt twinges on two separate occasions and ignored them; when my back went, it really went.
A timely reminder for me. I got a minor tweak in my low back. It feels tight more than it hurts, but it's in a spot I've never felt before. It went away after a couple of days, but Saturday's DL did not agree with it. I'll definitely take it slow. No sense turning a minor pain into a genuine injury.
I'll keep an eye on your progress here, as we seem to have similar goals at the moment (in terms of current program, raw numbers, and physical limitations).