Haven't tried any, but AMT does have at least weak MAOI effects (strong enough though that it was prescribed as an antidepressant in the Soviet Union) so probably should not be mixed. Also, note that there have been a number of cases where the much more potent 5-meo-amt was sold as AMT, resulting in deaths.
Also, your AMT will go much further if smoked (10-20mg strong dose smoked compared to 30-60 strong dose oral). I point this out because, unlike with most other psychedelics, the trip from AMT is not significantly shortened when smoked as opposed to eaten, so it will go further that way. Start low of course. And do a test run with 1mg or less(you probably know to do this). You never know for sure what you actually have. People recently died from bromo-dragonfly, active at under 1mg, that was labeled as 2c-e, which is often used in the 10-40mg range.
If you have multiple chemicals, make sure you get the right one and that they are clearly labeled. (I managed to fuck up with two very differently named substances, though much of the ink may have been rubbed off(this happens a lot). Instead of 50+mg diazepam, I got that amount of DOI)
I have read about 5-ABP and 6-ABP. Some of what I read has shown material sold under those names from some vendors to contain different mixtures of cathinones, including mephedrone, mdpv, methylone, buphedrone, methedrone(caused a number of deaths, has a similar structure to PMA(most likely it would not be a large enough constituent of the mix to kill you if it was in there), flephedrone, ethylone, and maybe more.
Some of the stuff sold as 5-ABP and 6-ABP contain no 5-ABP or 6-ABP at all. It could be the real thing, or a lot of different chemicals dumped together and mixed. They found maybe a dozen different things in some things sold as 5-ABP, 6-ABP, and Benzo-Fury.
That thread listing components of the fake stuff may be on bluelight somewhere. I just did a quick search and could not find it though. I ran into it recently when looking into acquiring some for myself. The bad stuff may be out of the system by now, I don't know.
Didn't read whole thread, but noticed some other combos being discussed:
2C-P combined with a low dose of an "herbal" cannabis blend caused very frightening, strange feelings in my body, nausea, and extreme panic. The same with DOI instead was similar, but maybe less severe.
Last time I mixed mephedrone with a moderate amount of herbal cannabis caused panic, vomiting, hypertension(in excess of 180/110), severe tachycardia (Pulse stayed 150-180BPM for an hour). It was 24 hours after dosing the mephedrone before my BP dropped below 160/100, so I'd say stay away from that, even on it's own. I did maybe 300mg over 4 hours and I know some people use well over a gram in one session.
I'd be concerned about mixing synthetic cannabinoids with any strong stimulants. though I've done it with MDPV on a couple of occasions with wonderful results. Probably won't repeat though. Hell, I have heard of heart rates well over 200bpm with real weed combined with stims and heart rates above 150bpm from real weed alone.