how often are you adding salt to conditioner for dc-ing?
i haven't done it in awhile. but when i was consistent, i would do it twice a week until i was able to get my situation back under control. i would dc with no heat for 10-15 mins. i had a serious protein overload issue. my hair was so dry, brittle, and it felt like straw. i would mix the salt with Tresemme Naturals. i didn't want to use a conditioner that had protein in it. i wouldn't use this method as cowash, but more of a deep conditioning treatment. i would cowash first, then dc.
if you don't want to use salt, you can use castile soap added to your conditioner too. it helps to hydrate and sort of open the hair shaft to receive moisture. i did this throughout the summer, but i can't find my little bottle of Dr. Bonners.