I had the same issue, I straightened after about 1 and half year of CG and my hair looked straw like and dry and even more poofy. After doing one side of my hair, I gave up straightening and went ahead and washed my hair. To my surprise all the shine came back in my curly hair.
Now I wear my hair curly all the time, no more trial straightening!!
3a with some 2a-2c, Medium/Low Porosity
Co-wash:deva no-poo/Vo5 kiwi
Leave-in:Shea Moisture/GVP conditioning Balm/AOHSR
Since long hair- I finger twist in big chunks, which helps till 5th day hair
Plop: Old T-shirt for 15 minutes ,diffuse