Moving weights might help, but I use a v-weight and have still had problems.
I saw a physio for similar symptoms. This worked for me, but might not for you if you have different probs:
1) Stand up. Both hands on small of back. Lean back with head forward (or you fall over) and hold for 10. Repeat until bored.
2) Assume the press up position. Raise your upper body (hyper-extend) without using hands. Use hands once you're stuck. The idea is to keep your nads on the floor as much as possible. 10 reps. As many sets as you can be bothered to do. I do one set, but very slowly.
I do them at night if I've had a twinge during the day. Other than that, get to the gym, go running and warm up and down. And get the lazy b*gger in your LDS to hump your tanks about - he's paid to shift 'em!
HTH