Yeah I tried the DMT vape cartridges twice and they didn't do anything.. just that bad smell.

Some people like using a meth-pipe/"rose holder" for DMT, but it's still not as intense as it gets

Best way is a gravity bong, imo. Whole bowl in one inhale, you'll hear The Sound and then you're in hyperspace before you even exhale.

Where did you try Ayahuasca? There's a ONAC Church here in Florida that offers it, called Soul Quest but I haven't tried it yet. Definitely had extremely high dose LSD + mushroom (sometimes both) where I lost all sense of being though. Set, setting, and intentions can make a big difference.