Yeah, i completely agree.
Tbh, this is actually my first time searching for a chart but i have similar findings written down in my notebook.
The end of last year, when fent analogues were super cheap(and still legal in china), i bought a few to use as reference cause i was using, admittedly, too much H and wanted to be safe(r).
If you can get pics to post(might be because im using BL mobile that it wont work, i dont know) id recommend posting the image(or even makin a new thread) for everyone. It could prove to be a helpful resourece as im sure were not the only ones who havent seen it