I'm sick and tired of cleaning postmaster after every GM... This time I even left just the stacks of ascendant shards and prisms (because limiting how many resources player can keep in inventory is someone's genius idea) to avoid postmaster overflow, ran 2 GMs - both stacks are gone, because RNG decided that I must receive that pile of blues, among other things I don't need!! Why am I still, basically, getting punished for playing the game!? How and why is this still an issue that exists?! And yeah-yeah, sure you can run DIM's "farming mode", but it messes up inventory on all characters very badly and existance of said "farming mode" doesn't mean that this problem should continue to be.
If you are trying to store stacks in the post master, do you really need them? I get that caps should be higher but if your inventory is capped and the excess is sitting you your post master, you can probably stop stressing on materials.