Causal determination doesn't mean that the effect is under the power of the cause. To say that a cause necessitates is to say that a cause causes. Even if our behavior can be predicted with some accuracy that doesn't entail that it is constrained.

While it is true that physical processes provide a restricted framework for our actions, it also true that this framework merely provides probabilities but not certainties (in most cases). For example, it would be ludicrous to claim that an introverted person could never perform an extroverted action, it would only happen at lower frequencies. The introverted person may raise this frequency to the best of their ability, which is essentially what free will is. This is what I mind is the biggest problem with determinism, in that it provides such an unnuanced view of processes and completely rejects the concept of actors in a framework.

The conscious aspect of our mind controls 10 % they say. So we have little free will. Even a little. But most of our will as you say is under the "automatic" control. The subconscious mind only sprouts what the conscious mind seeds it with