Bad, bad development. I've got some loss of strength and that telltale ache in my left quad. This means that the narrowing of the foramen in L4 is squeezing on the spinal nerve that innervates the quads. It's almost certainly aggravated by my current lifting regime. Looks like 10 - 14 days off from the squats, for me. That puts my goal of 300 pound squat by the end of Feb in doubt, which is too bad. Then again, I got this far, which is a big improvement. It just means I'll be working on core and upper body for a couple of weeks.