I've never used DMT before an acid trip... I don't think... although maybe. I have smoked dmt on acid quite a few times though, and it is absolutely incredible. If you have enough dmt you should smoke it a few times during the acid experience. Always attempt to break through. You will go out of this world for 10 minutes, then come back to an acid trip, where I generally go into analyze mode. It's cool if you want to analyze the fuck out of dmt.
I've seen friends get spun of this though. Sometimes the acid can spin you the wrong way after a dmt trip (this has never happened to me, but when seeing it happen to a friend it reminded me of my experiences with salvia). The friend came out and for about an hour he thought he had lost his mind.... he wasn't sure if he was really here or not... and if the actual world still existed for him. An hour later he broke through yet again... and it was awesome.... then an hour later yet again and it was awesome.
DMT can be pretty damn intense, especially if you have a lot and your goal is to break through a bunch of times.... It will give you one hell of a strange night... that's for sure.
For me, its only strange looking back on it (now, for instance.) While in the experience I am sure everything felt completely natural, and like I was doing no wrong. I have had other experiments where I severely questioned what I had taken and whether I should take more or if I took too much... when I did acid dmt.... I took a good amount of acid.... chilled inside and smoked dmt every couple of hours... and while i was fucked up completely, it felt very safe and cozy throughout... For 2 likely reasons... 1. acid is awesome and dmt is absolutely joyous. and 2. because I was living on my own... so I knew I could be completely vulnerable so it made things easy... I'm living with lots of neighbors now.... so I don't trip that hard anymore.... not here, at least...
on a related note... I've seen a friend get spun in a bad way from deemstirs after doing a pretty strong amount of 2c-t-2. I refrained because the 2c-t-2 worked way better than I had anticipated and it led to a frightening couple of hours, then an awesome couple hours, then feeling pretty strung out.... but my friend decided dmt was a good idea.... I couldn't.... I don't know if it was cause I had been binging on it in the weeks prior to and after this experience or because the 2c-t-2 just whomped me hard (probably both).... but I decided to refrain. He did not enjoy his experience... I can't recall exactly what he said. There were negative vibes around the situation, which I found quite sad... cause it was really a beautiful experience. IT was very unexpected and may have caused some stress as we both tried to bring the drug's energy to the best possible place......................... weird times!