Check your products for protein, and cut them out temporarily to see what happens, then introduce them again and observe your hair closely. That's what I'd do, anyway :-)
F - LP - HD - NE
Fine, low porosity, high density, normal elasticity
Hairtype 2c

Low poo: Weleda Oat Replenishing Shampoo
Protein: IAGirl's gelatine treatment
Detangler & LI: KCKT
Styling: KCCC

Beauty Is Not a Number