I understand. Low-pooing, in whatever way I was going about it, never gave me any trouble though (other than dry hair which is why I started cowashing. But now that I know about leave-in conditioners and deep treatments etc. I don't really need to cowash for the moisture anymore.)
I understand about being gentle though but I always thought it was emphasized that you have to massage your scalp well while cowashing. The thing is, when hair is wet it is easy to pull out... that's why it's easier and less painful to tweeze your eyebrows soon after a shower than when completely dry.