Good idea. Once I get it all sussed I may add Rue tea into the final attempt.

From what I gather DMT is is a lot more soluble in PG over VG. I don't recall coming across actual figures however.

Luckily I have some nice white heptane re-x'd crystals

I believe so, yes. Higher the voltage the more of the liquid is vaped. I reckon starting at maybe 3.5 and working up is a sound idea. Also I think the impedance (if it's something else someone by all means correct me) of the cartridge might have something to do with it, will have to search again and check.

I have a bottom coil refillable and a mid placed "wick" tank. Will be trying them out in that order also as I think the bottom coil type will be much more viable.

All being well the coming weeks will see if this is a potential or just another fail (has been tried before as you say with mixed responses).

Peace