What settings are you using on your diffuser? The frizz may be caused by you having the dryer Ary too high, yet using the lowest speed with a low or medium heat, and don't touch your hair at all until it is totally dry. Plopping before diffusing I think helps the product to 'set' on your hair, reducing the amount the curls break up while drying, so may also help.

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2C, Medium thickness, Low posity
Recovering from a year of keratin and bleach with CG

Routine

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.