I just used regular tahini and had no issues with bitey-ness. I did realise at the last moment that I was out of cumin so substituted with garam masala.
I made CardaMom's tehina recipe to make this, and whilst I loved it, I found this a bit "bitey". I'm not sure if it was the eggplant, or if it was the other dose of raw garlic added in this recipe. It was good, but not as good as the creamy, yummy tehina.