Prepositional phrase functioning adverbially or adjectivally?

With a reasonable understanding in the subject, I am very interested in Nutrition.

Immediately when I read this, I relate the prepositional phrase to the predicate. So I see this as a prepositional phrase functioning adverbially, saying why I am interested.

1) But should I change this to the following if I don't want it to appear adverbially, but rather if I want it to appear more as a trait of the subject?

I am very interested in Nutrition, and have a reasonable understanding in the subject due to self-learning.

2) If I want it to be adjectival and not at all adverbial, would you agree that it is best to avoid placing it before the subject as done in the original above?





Thanks