What do you think a landrace has that a hybrid doesn't, genuinely interested.
That's a good question. Why would anybody look for landraces, while they are obviously worse in production, flavor and potency than modern hybrids, and they usually need more time to mature and are very unsuitable for indoors?
The only reason I grow sativa landraces (or old strains, I don't know if all of them are really landraces) is the effect. They are usually mild or weak, but the experience they provide can be a new one. Stimulating, schizophrenic, happy... or not.
By far, the best results I've got came from old hybrids coming from the tropics. Sativas mixed with indicas in the 70's or 80's that have evolved and have been selected in their environment to produce weed similar to the original sativa landraces but with a little "spice" from indica hashplants. That indica influence had a lot of effect in production of resin and strength of effect but not that much in the clarity of the effect. Not indica hashplant stone, but sativa happiness.
Taskenti is not a landrace, nor a sativa, so it is not weak at all, all the contrary, it is very strong. There are very nice properties, properties probably coming from hashplants from Uzbekistan in that strain that makes it very valuable for me and others.
I believe there are quite a lot of strains similar to what OP looks for, but I would ask first what is OP looking for in these herbs. I'd like to help.
Cheers