I've noticed that yes there is headroom, but 15%? This seems like alot, but honestly I'm probably undervaluing it myself (something I'm working on).

As I'm just now transitioning from being what I consider "mid" level to "senior" (relative titles I know), I'll try to keep your comment in mind for future jobs. It makes me a bit sad that this game has to be played so much in order to get the full value of your worth.