Sounds like overload, yes...I had the same type of problem with my hair and it took me finding this website before I could figure out what was wrong (a lot, as it turns out ;p) it took me about 2 months of taking out protein products from everything I use, and really DT'ing with moisturising oils etc before my hair really began recovering. Now, I can do the protein once every few weeks and that is enough to do the trick

I have read here that it is a good thing to add protein back slowly into your regime, and being careful to notice which protein does what to your hair - I make sure if I use protein that it is natural (like the yogourt) and not in my products. That way i can control what kind and how much I am getting

Hth!
MissKris, I'd trade my silly S's for your Z's

lol! It sounds like you take awesome care of your hair
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Finer, mixed with coarser strands, low-porosity, wavy curly whirly hair...3A, 2C hair. Medium thickness, medium elasticity.
S-shaped hair with corkscrew ends. My hair is even more confused than me ;p
My hair officially hates protein

Once a month is enough!
Currently a fan of TiGi products, (rock on, TiGi Curlesque styling creme!) but that will soon change - I am a self-avowed product junkie! Yay!

BIG fan of supersoaker method - thanks Rudeechick!