If I see what you mean-I think dynamics are more of a relative thing, anyway. As long as you have them correct relatively, you should be fine. After all, what is pp to you might only be p to someone else. For example, as long as you play the p sections louder than pp, and quieter than mf, I'd presume you should be fine.
It's true-the dynamics, phrasing, and touch are part of what makes these pieces so difficult, yet so magical. Ravel can be like that!