I just switched a small shallow diffuser for a bigger bowl shaped one (so from the one that came with my dryer to the on-air pro universal) the difference is honestly surprising. I have less frizz and curlier faster drying. Best I can guess is that the bigger deeper bowl allows for better air flow.
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2C, Medium thickness, Low posity
Recovering from a year of keratin and bleach with CG
Low Poo, Condition, Leave in, Curl cream, Supersoak, Gel, Diffuse on high heat, with minimal lift to encourage waves and reduce frizz, Dry on cool with nozzle down to smooth hair and finish drying,Shine Serum
Weekly gelatin protien treatments.