I hear only about a third of people who try it like it enough to do it again. Of those people, many stop liking it after x number of doses. I still enjoy it on rare occasion. I can vouch for the salvia combo; the dxm really trims the salvia monsters' claws. Like you, I also tried 5-meo-dmt with dxm. I was hoping for an extreme dissociated state. I got it. It was my first time experiencing ego death rather than mere ego dissolution. It was like vacuuming oblivion inside out. It was bizarre and very unique, but a one time deal.
I assume the reason it makes some psychedelics more comfortable body-wise is just because it's a dissociative, which 'isolates' the mind from the body. I imagine this is why it potentiates the mental aspect of psychedelics as well, though the same is/might be experienced more safely in a sensory deprivation chamber (e.g. John Lilly). That stated, those psychedelics that that have a strong cerebral component and don't rely on the 'sensual' for their effects as much as some others (in your own experience), are probably the best candidates for a dissociative combo, dxm or otherwise.
