1. 'what should I take'-threads are not allowed here.
2. I suggest you do some research at least on the general type of substances you are dealing with. there's psychedelic phenethylamines, dissociatives, stimulants, an opiate and a benzo. I don't wanna sound rude but if you seriously consider mixing some of those substances with psilocybin it doesn't seem like you're prepared to handle potent psychoactives. (to at least partly answer your question: escaline/proscaline might produce a worthwhile experience in combo with 4-po-DMT.)