Sorry, but I am not an expert on ayurveda yet. I'm starting a two year program at Sai Ayurveda College next month so hopefully two years from now I will be an expert on this. From the little I know, yes, you are most likely to develop imbalances in your primary doshas first. From my experience the doshas seem to have a synergistic relationship, they work together in various ways. In your case I would wonder about the relationship between pitta and vata, when pitta is high, this can throw vata way out of whack also. The most important taste for pitta is the sweet taste, which can be appeased in a healthy way by eating sweet fruits and healthy carbohydrates.