My ponytails are flat too. I get good volume by putting the lower half in a ponytail first, then adding the top in with a second elastic around the whole ponytail. Then I can leave the top looser and fuller without sacrificing the hold. Someone on here used that trick, I'm sorry that I can't remember who!
Curly work in progress
2C with some 3A if all the stars align
Low porosity, medium to low density and fine
No sulfates since 2009
CG since 2013

In my stash:
Shampoos and conditioners- Tresemme Naturals Low Poo, Tresemme Naturals Moisturizing Aloe, Suave Naturals Coconut
Leave Ins- Kinky Curly Knot Today
Stylers- KCCC, AG Recoil, KY Lubricant (yup), SM Curl Milk
Gels- Ecostyler, Biosilk RHG
Mousse- Devacurl Uplifting Foam, Suave Captivating Curls