I have 4a hair too Tiff! From my expensive trials and errors, here is what I would try for u:
1) Best Cowash - As I am Coconut Cowash Cleaning Conditioner
2) Clarfify once a month with a clarifying (with sulfate) shampoo of your choice. But be warned it will make hair feel awfully dry but it will remove any potential stubborn buildup
2)best rinse out and detangling Conditioner (No silicones and sulfates so curly girl friendly) - Trader Joe Tea Tree Tingle Conditioner
3) best leavein - Kinky Curly Knot Today
4) best gel/curl activator - Hawaiian Silky Curl Activator (the pink one)