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 - mod. CG, med. to fine, normal to low porosity/normal elasticity
Current Main Rotation: MG217 medicated, GTTT or Aim2Health 'poos as scalp needs, YTCarrots or Elucence cond., Spiral Solutions Protein Trtmt & Deeply Decadent Cond., CJCCCC reg or lite, KCCC, AO Mandarin Magic, Giovanni LA Hold Hair Spritz + lots more, sporadically
HG Method: Super Soaker + Smasters-ing, brief upside down diffusing then clips or clamps & air dry. Blend gray w/henna glosses