I kept getting this weird sour taste with my 1:8 ratio cold brew, so I tried extending the steep from 14 hours to 20 and switched to a coarser grind from my local shop in Portland. Turns out the finer grounds were over-extracting even at fridge temp, and now it's smooth with zero bite. Has anyone else found that grind size matters way more than steep time for cold brew, or is it just my setup?