I think before trying to combat shrinkage, you should try to work with your properties (use the link by Kathymack). I sometimes use the diffuser, but you still shouldn't use it extremely often. I agree with Kathymack, you should learn to love your curls- shrinkage or not.
High porosity, Fine, Low density, Normal elasticity
Co-wash: Suave Naturals Coconut Cond.
Conditioners: Loreal Advanced Haircare (ceramides) & Giovanni's direct leave in
Styler: KCCC, Organix pomegranate green tea styling mousse, La Looks Nutra Curl
Sealer: EVCO, SM elixir
Protein: Gelatin PT