Wow, I've always put about 4T ACV per 1c water and don't have any problems. I wonder if it's over time that ACV can ruin your hair. I'll be more careful! I've been kinda bad at remembering to massage my scalp w/ jojoba everyday, but I think what helped the most was to stop CO-washing and just do water rinses between low-poo's.
I'm not sure if it's something in Suave Naturals CO causing the itchiness/flakiness, but I haven't had ANY scalp issues since the day I stopped CO-washing and did the ACV/epsom rinse.
Tell us if it works! That's an interesting experiment!