I've had failures with TEKS as well.
Finally I got sick of failing so I made My own 'tek' after years of reading various types here on the Nexus and elsewhere. I also read up on the solubility of DMT and the PH levels best to get it out [[ above 8.5 I believe ]] of the 'Material'/Plant Matter/Vegetation. I THINK the following may even work for the 'Grasses' and the 'Leafs' containing Deemsters -
I take the ACRB and do a COLD WATER extraction with Citric Acid. It takes longer[[ About a week ]] but I find it keeps a lot of the 'fats' and 'oils' out. I just cover about an inch or so above the bark with SPRING WATER [[ NOT tap. I don't know where YOU live but there is all kinds of crap in tap water that can effect the process where I live so I spend the little bit of cash for Spring ]]and shake it up every now and then for a the first 36 hours. Then strain and do it again but this time it's already saturated so I only do it for a day. I do this about four times. Usually for the last one I'll freeze it first. Then I'll proceed to soak in acidified spring water for about 12 hours and strain.
I don't grind up the bark, I don't do anything with it, I just take it as I get it [[ Shredded ]] and it works just fine. I tried grinding it up first but it made no difference besides being a little quicker.
I combine all the extracts in gallon jugs and keep them REFRIGERATED or else mold can grow. Then I simply reduce to about a fourth of it's original volume, filter while HOT a few times to get any fibers out and after it cools I use calcium carbonate to get it up to around PH 8 and then a little lye to bring it to above 10, or, as soon as the emulsion from the calcium carbonate dissolves, it's ready.
Then I only use hot heptane [[ in a water bath ]]and I keep the Brew hot as well.
When I'm all done pulling, I go back and use 25/75 Heptane/Naptha to pull whatever there is left, usually mostly NMT and the 'Goo' [[ Which I find to be enjoyable in it's own right ]].
I have tried boiling the bark then filtering and reducing but it just made it way too oily and I got a LOT of the 'goo' and a few crystals that way, unless I used a 'slow evaporation' method. Then the crystals would grow but on the bottom would be the goo so I'd have to drain off the solvent then pick the crystals away from the goo.
I think that the more time taken to get the goods, the better results but I havent tried a dry tech yet and I'm not sure if I want to do that with ACRB. Mimosa is available if you know how to find it [[ Using different names ]] but it's double the cost of what I get the ACRB for so... Whatever you do: DON'T GIVE UP ! It took Me a few tries to get My own process down but it's worth the effort. I even have gotten crystals that LOOKED great but did NOTHING and believe me THAT was frustrating ! So, keep trying, you'll find a TEK or come up with your own, if you really really really want it - Good Luck Friend !