My brother in Christ you're sourcing illegal drug raw materials from some strangers in China of all places, who are producing outside of licenced channels during a tumultuous market with their shut downs and raids. Out of curiosity - if their solution, which everyone seems to find reasonable, is pitiful...what is it that you're expecting? You're not exactly dealing with Amazon here. I'm not being facetious, genuinely asking; if their solution is pitiful, what's a good solution for you?
Agnostic of the price, which is a function of market conditions, you've been given something workable.. no you shouldn't be happy with 89% but the good news is neither are they (AASraw). They're making it right it seems. Probably much better than many other vendors tbh.