"Granularity" (from Wikipedia):
The terms fine and coarse are used consistently across fields, but the term granularity itself is not. For example, in investing, more granularity refers to more positions of smaller size, while photographic film that is more granular has fewer and larger chemical "grains".
So, the term "too granular" is a bit ambiguous. "Too fine-grained" would convey the intended meaning more clearly.
Sorry for being such a poindexter...