I don't think you totally have to be CG, but I agree with the last part of this. Your hair will only curl if it's moisturized. People need varying levels of moisture, but generally MO and vinegar aren't going to moisturize most people's hair. You probably need to be using a pretty good conditioner, and clarifying occasionally to make sure that moisture isn't obstructed by buildup.
Fine Texture, Normal Porosity, Normal Elasticity. Dyed to brown a few months ago.
Lowpoo: Trader Joe's TTT Shampoo
Rinse Out: Yes to Carrots, AOHR, Aubrey Organics Rosemary Peppermint
LI: Yes to Carrots
Stylers: Shea Moisture Curl Enhancing Smoothie, LA Looks Sports, Suave Professionals Captivating Curls Whipped Mousse