Try this protein pack Live Curly Live Free - Home Remedies or IAgirls gelatin PT you can find her recipe over in the 2's forum.

Good Luck hope something works for you, let us know how it goes. Do follow up your PT with a DT since your hair sounds like it's rather temperamental, I wouldn't skip that step.
Discovered CG 2007

2C Fia BSL/Thick/Med-Coarse/Low(crown)-Normal Porosity Protein and Oil Sensitive

Link-Spritz & Condish Washing

I'm aCurlJunkieJunky

My hair LOVES Coconut DESPISES Soap Bars

CJRehab or H&B Fix, Deva NO POO, EO Rose & Cham POO & Condish, CJ CurlFix, CJ Pattern Pusha, CJ CIAB, SS FHG, KCCC, BRHG, AG Mousse Gel, ACV Rinses,Shikakai Conditioning Hair Rinse.