It seems to me that a physical phenomena is both physical and phenomenal.

I think the big problem is the word "physical"; loaded with meaning, highly deceptive. Physical just refers to a phenomena that we can describe with physics (conjectured mathematics tentatively accepted due to good fitness with observation).

I think any physical description of reality should leave out the word physical. It shouldn't be part of the argument. We in retrospect apply the adjective "physical" if there are mathematical models reliably predicting the out comes of experiments.

It also seems a bit peculiar to me that anyone calling themselves a rationalist would believe that the brain is primary to the mind. But I guess that's the world we live in.