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, Thin Density, Low Elasticity
Co-wash, leave in, and gel: Alba botanica coconut cond., ogx mousse, &/or super wet look gel.
Curls