@benson- Just tried adding some crystal d-meth to my roll a few weeks back and was very happy with the results.
I added 200mg phenibut and 2mg pure d-meth onto 125mg of very good safrole MDMA. (There were other substances mixed in but that's kind of irrelevant. I mention the phenibut too because it definitely had its role as well.) The roll was spectacular and at that dosage I felt an increase in euphoria, stimulation, duration and empathy with zero shitty comedown. I felt that dosage was perfect and anymore would be pushing it, with that said next time I try it I'll be using 2.5-3mg so I'll know for sure how much is too much.
Note I also took it an hour before the MDMA.
I did not feel like the MDMA was overpowered at all, more like a boosting of its effects.
This experience was amazing, so much happened in one night.. Me and my brother walked around the small festival we were at like we owned the place, cracking jokes so often I fell over from laughter more than once, got into really deep conversation about our past, hitting on ladies and danced like a god.. I still get goosebumps thinking of that night. The moves I was pulling off was blowing even my mind, I was so in sync with such precision. I was hyped up and hyping up everyone around me in the process, it felt like I had my hand on the "hype dial" and had that bitch cranked to 11. Too much fun.
The only downside I see is potential addiction issues..
-GC