You can do a stretch test to help you determine if it is protein - it could be something else causing the problem. Protein overload typically results in dry and straw-like hair that tangles up when wet. If it is protein, you can only remove the protein containing products and do lots of conditioning.
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remember, with all advice or suggestions for your hair, YMMV!! 
My hair:
2b wavy, medium texture, low porosity, med-high density. Protein finicky.
My routine:
Cleansing: DCNP, every 4-5 days (occasionally use CJ cleansers).
RO: CJSC, occasionally use JCDC
LI: KCKT or CJSL
Gel: KCCC, CJCIAB for 2nd day hair (sometimes third)
Heat is my friend: warm water rinses, steam caps, and diffuse dry. I love CLU cloths and my Denman.
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