Nothing more than all the things I've already suggested.

Unless you're bound and determined to be strictly CG, why not shampoo? Many of us find we simply need to. If not that, you may just need to co-wash more than twice a week. If you're not itching, it sounds almost more like product build-up flaking than anything - be careful about overdoing it with styling products, especially on the scalp. However often you co-wash or low-poo, it's important for anyone to scrub their scalp well, especially if not using shampoo.
2C/3A/3B - modified CG - fairly fine now, normal/low porosity/normal elasticity

Current Main Rotation: MG217 medicated or Aim2Health 'poos for scalp, Elucence cond., Spiral Solutions Protein & Deeply Decadent Cond., CJCCCC reg or lite,CJ Pattern Pusha,, Giovanni LA Hold Hair Spritz + lots more, sporadically

HG Method: Super Soaker + Smasters-ing, brief upside down diffusing w/360o diffuser then clips/clamps & air dry. Newly gray - stopped my henna glosses!