This is getting confusing. If it’s me, then it’s clear that I tweaked my back on a weight which is substantially less than my working set. If it’s Will, then I can’t imagine leg curls are going to help the sock problem. Meanwhile my tweak is causing me fewer problems and I’m going to be far less cavalier about back off lifts at sub maximal weight, particularly when using straps. It’s the easy ones that get you, the tough ones make you really work the form.