Thanks for the responses, ladies! Gills, that makes perfect sense. I've been sticking with the same products for the past couple of days and have liked my hair so far, so I'll start tweaking one product at a time and letting that go for a few days to start isolating individual products.

Sounds kind of like methods for identifying food allergies! I guess I'm looking for my hair's product allergies

Thanks again!
Trying to figure out porosity - medium to low, I think? Medium texture, rapidly greying, and free of dye/relaxers since 2010. Recently chopped from hip length to a jaw-length stacked bob

Claim to fame - Inventor of plopping when it was called "the towel trick"!!

Cleanser: Deva Low Poo
Rinse-out/LI: Deva OneC, Curl Keeper
Styler: Krystal Ecostyler