You aren't using a bank? Or you are trying to farm like 10 dungeons without clearing your items.
There's also an avatar item that adds 6KG, but your Plate Armor weight is offset by the increased weight allowance on the Asura. Look at mage, there is no way a mage can carry full plate armor. That would take like 85% of the weight right off the bat.
I've never ran into a weight problem though... remember to invest the 1k NX into the bank then its like 734928476239874 times easier. I store all my cubes and Ryan Cokes and etc