Wow, so I've met people here on NC.com with similar hair types who are my hair twins...but you are like an identical twin! haha(: I have the exact same type (with the mixture of 2's,) same porosity, density, width, and even the length comes pretty close.
Do you use any styling products? Sometimes, those help me maintain my curls through the second day. Also, I found that Yes to Carrots didn't work too well for me. The shampoo didn't really clean enough, which might be the nasty feeling you're mentioning. I agree about the co-washing, too...greasy on my hair. My experience with YTC Shampoo could be different for you, though! Also, for second-day hair, pineappling at night has worked the best for me. I put all my hair up on the top of my head in a loose scrunchy and sleep with it over the pillow. Work great!