Core amp stands--load bearing capacity

Hello,

I have Krell Evo 600 mono amps (135 lbs apiece) and had them on Core amp stands. One of the inserts is warping, and the joinery on the bottom is opening up and spilling the dampening compounds from the inside of the insert.

Sent an email to Core to see if I've exceeded the load bearing capacity, and wondering if anyone else has has similar issue with the amp stands with amps of the same weight.

Thanks

Mitch