At first glance, I think you may be using too much baking soda, but hey -- if your hair looks good, go for it. The first time it'll look nice because you're getting rid of dulling residues and pretty much doing what a clarifying shampoo does -- getting rid of mineral deposits and other junk from your hair.
For sustained washings, you may need to cut down on the baking soda. Then again, you have longer hair, so you may need to use that much. Keep doing what you're doing and see if your hair starts to look or feel brittle, snaps easily, goes totally flat and staticky or frizzes. Those are all signes of too much baking soda and not enough apple cider vinegar. If none of that happens and your hair is bouncy, pliable, and manageable, you're doing okay!
For sustained washings, you may need to cut down on the baking soda. Then again, you have longer hair, so you may need to use that much. Keep doing what you're doing and see if your hair starts to look or feel brittle, snaps easily, goes totally flat and staticky or frizzes. Those are all signes of too much baking soda and not enough apple cider vinegar. If none of that happens and your hair is bouncy, pliable, and manageable, you're doing okay!