Try to remember the flexing during the other stuff. Also, you don't have to with curlups. They flex, but holding them flexed and curling up against it is usually different. Good call, cutting it down though. Daily core work for endurance as you're doing, just like you said, is definitely enough.
My back hasn't bothered me in some time luckily, and I've been able to do rows without a support. Fairly heavy, too. The rest of my "routine" (kind've just a mixture of upper body stuff, with the occasional deadlift/squat/clean thrown in, just to text my back) is
going, I guess. I haven't had much of an appetite and I've been on the most screwed up sleep schedule. Fourteen hours of sleep straight, then up 40 hours, then sleeping 12, then up 10, then sleeping another 6. I have no idea why, but it's really annoying me, so I haven't been holding much together lately. Hopefully things will adjust themselves soon, and I can be on a solid eating plan. Problem always is, that when I don't eat right, I skip my training. I see little point if I'm not well-rested or nourished anyways.
Whoo, I must be a drama queen too! Look at that rant.
Oh, and you're welcome AB.

Keep it up and you should be pain free in a short time. Just don't rush into the squats. I tried that two or three months ago - my back hurt again for a week. I can get away with them once a week now, though, and I feel good. Maybe I should train like a BBer.
