I've never had much of a spiritual feeling from DMT, either. But once when I was on LSD already (but the tail end), I smoked this guy's DMT and without even smoking any of it himself, he was on my trip. We had been talking about some really deep, personal stuff for hours beforehand, and he also was on the tail end of LSD. I was looking at him when I hit it. He was describing everything I was experiencing while it was happening, we both kept saying "how could this be happening?" And we talked about it afterwards. It really blew my mind. Then the next night, I was just chillin, and randomly at night I had a panic attack out of nowhere. Found out the next day that he had overdosed on fentanyl and died at probably the same time as I had my panic attack, I can't be sure if it was actually the same time but it was definitely around then that he died based on when he was found. I can conclude nothing other than we made some sort of connection and bridged the gap between individual selves, or something.
Even then it didn't feel "spiritual" like I've felt on mushrooms or other psychedelics... it just felt natural and the reason it blew my mind is because I know that's not normally how it is. I was also, on that DMT trip, experiencing peoples' conversations shifting into entirely different conversations and back again as I turned my head, and I saw a glowing net, or like 3 dimensional graph paper, that was surrounding everything and we were all moving to its motion, I could tell what everybody was going to do before they did it based on watching this net moving.
That was by far my best/deepest DMT trip. But it was a combination. I also just remembered both me and the guy whose DMT it was, who died, had both taken like 30mg of MXPr beforehand, too. Although it felt very mild, it surely had some effect on the trip, too. Dissociatives are powerful potentiators of psychedelics. I can take a very light dose of MXE before 2C-B or really any other psychedelic (but it works REALLY well with 2C-Xs) and the trip will be no joke, like 3 times as powerful. It'll be a dose of MXE that just makes me feel a little loose, and 45 minutes later, a dose of 2C-B that would just be an average dose to have a light trip, and it'll have me tripping so hard I can barely tell what I'm looking at and my senses are merging.