There is a whole lot of erroneous diagnostics on haircare forums IMO. Coconut and jojoba oils have little to do with protein, the 'acting like protein' thing is pseudoscience. Coconut oil helps the hair retain
more of its structural proteins, if that property alone made your hair badly behaved then virgin new growth would be far more of a nightmare than your naturally weathered ends.
Amino acids are the building blocks of proteins but they are too small to build up, they are very water soluble so will largely wash right off hair again. Try reading haircare blogs written by those with a science background - 'curl chemist' here on NC, Natural Haven for example.
2a-2c, medium texture, porous/ colour treated. Three years CG, growing out mechanical and chemical damage = breakage and very high porosity. Past armpit length heading for waist.
CO-wash: Inecto coconut
Treatments: Komaza Matani, coconut oil, Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss ultimate volume, Inecto argan
Styler: Umberto Giannini jelly, Boots Essentials gel
Experimenting with: going back to basics