I have just enough coins left over in one DNM wallet to cover shipping costs of something I'm trying to order in another market. Is it shitty OPSEC to send directly from one to the other because it's linking the two identities, or does it not matter because neither of them are tied to my real identity anyway?
I have done it a few times, I cant see it being shitty opsec to be honest because as you said neither are linked to your real identity. If you are that paranoid use a tumbler but i really don't see the point if your are just sending a tiny amount of btc. And if you are only buying a daft bag of weed i doubt LE are going to care about you.