Weird waxy hair with BS/ACV and clay/ACV

Hi, I’m new to no poo and struggling… My hair was gorgeous with sls free shampoo, I washed about every 5-7 days without grease.
Now I washed every 7 days with BS/ACV and tried clay/ACV and both ways I got a sticky waxy feel in the lengths. The roots are fine and grease free for about 3 days and then I BBB to get the sebum to the lengths which I can keep up for 7 days. The ends are dry and stiff after washing and I’m very unhappy…
Does anyone have a solution how to get rid of the waxy stuff?
I don’t think it’s build up, I didn’t use any other hair products than sls free shampoo. My water is quite soft too…