I find few things more annoying than non-specific criticism, especially if it's supposed to be actioned. If you pressed the guy, and he wasn't able to be more specific, you're shooting in the dark. If you didn't ask for more information and just came here, you/we need more information.
Depending on how well your director understands what he wants and how to ask for it, you might need to be louder, compressed, re-eq'd, change your technique, change your timing and dumb your playing down; take your pick. I've come up against this problem before without resolution (well, we fired the drummer, good enough