i second the hair diary idea, i did that as well, and used it in a blog..... have you thought about that you may be protein sensitive? if my is is really dry i sometimes think that some sort of protein slipped into my routine. I was still having trouble so i stopped using products al together and was just using nautral things, now i only really use oils and a natural condish.

my hair: 3b, high porosity, high density and coarse hair (i think i finally figured that all out)
my hair loves conditioner only styling!
Oils and my own procuts are my hairs best friend
my hair goal length is bra strap length when curly.