iron bridge is like an upside down pushup, where your pack arches and your belly sticks up in the air.
you can also do iron bridge pushups, which helps as well.
i think back problems can be caused by an imbalance between abs and back.
You may want to do those good mornings on the hyper extension chair whenever you do abs, in addition to the strength training with the weights.
I've been on this kick lately to center all my weight workouts around compound lifts:
squat, deadlift, dips (or bench), and pull/chin ups (or bent/seated rows). But if you wanna focus on deadlift, you could probably even do it almost everyday if you did 3 sets of 5, working for pure strength.
I Love It When They Call Me Pork Chop-pa