My first thought is that the shelving you are using might deflect more than you think. I see that you have already filled it, hopefully it is not deflecting more than a 1/2". What to look for: The load beam "rolling" toward the center of the shelving. You may be able to remedy this with 2" x 4"'s screwed into the load beam.
I know this is PITA, but pallet racking will offer a gauge of steel and a load beam that, IMO, would be sufficient for these types of static load capacities. This stuff is most likely Chinese steel and you can't trust the manufacturing process. There was a large import of Chinese steel pallet rack in the early 2000's here in the Bay Area and was quickly shunned after some serious catastrophes (and all of the litigation that followed).
If you have any questions, PM me. I'm in the material handling industry and I've seen a few LFS using this type of shelving and I don't believe that the stated capacities are accurate.
-Mark