Warming up the low back for DLs

I generally avoid squatting and deadlifting first thing in the morning, as my back is always tight for the first few hours of the day. I decided to go for it today, with my typical half-assed warmup routine of leg swings, various glute stretches, the elbows-in-knees "squat stretch", and of course, light sets.

Even after all that, I still didn't feel right, and I stupidly went for and cat-backed my work sets (not intentionally) anyway...didn't realize it was so bad until a trainer actually offered me a free lesson out of concern.

I know the easy answer is to just lift later in the day when I'm good and limber, but I do need to be more disciplined in my warmup routines. What do you guys usually do to get ready for DL work sets?