Flip your shelf and leave a few hardback books stacked up in the middle. After a couple of days it will straighten out. I've had to do that a few times with my book shelves. Takes a bit of patience, but it's worthwhile. It probably won't get perfectly straight, but it will make a difference.
I've flipped and reinforced it many times. The shelving is just too weak to support those box sets so it always ends up bowing. I just got tired of flipping them. Need new shelving at some point.
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