Most of the recommended teks in wiki and mentioned in FAQ can yield you 1+% with good bark, if done thoroughly.
Usually choice of teks is more related to availability of chemicals in one's area, as well as general preference of which tek one feel most easy to visualize when reading.
Just get mimosa from a reputed supplier, check the supplier section and then remember the usual tips that apply to extractions: Powdering material, doing at least 3 better even 4 acid boils in a/bs, enough base specially STBs and when using naphtha, using enough solvent per pull, doing a few thorough mixing cycles before pulling, pre-evaporating if freezing, doing 3 salting pulls on solvent if salting, reusing solvent and/or evapping till the end towards the end to retrieve final alkaloids, doing at least 5 pulls if with naphtha/hexane/etc and making last pulls warm and long for a couple of days and evapping/salting separately and if significant amount is still crashing out, keep extracting,, etc)