I agree with lots of this--the realistic, chunky substituted tryptamines are very good at amplifying the significance of real, chunky stuff in the world. The dissociative anesthesia of dextromethorphan, on the other hand, makes real stuff seem ridiculous.
My recommendation: combine them. DXM first, then wait at least 2 hours after dosage, ensuring no nausea combination effects, then take a low to moderate dose of a tryptamine with aromatic substitution (never tried it with unsubstituted N,N-dimethyl). Psilocybes work great, and am planning to try with psilacetin. 2C family phenethylamines also work very well.
Oceanic euphoria of tryptamines + samsaric contentedness of dissociatives = pure, undiluted awesome. With 2C-I as the combination, I and two friends started speaking different languages simultaneously--English, German, and Russian. Coolest thing ever.