Love it when folks don't hear what they want so they go to another forum, only to get told the same thing...
There's a reason everyone keeps telling you to upgrade those subs. It's not just for more bass. You need clean, "quiet bass" (a term I just coined, I think...). For example, I went from a pair of 10" subs very similar to yours to a larger, more powerful pair of quality subwoofers and thought they weren't working properly because they didn't seem as loud as the old ones.
What I wasn't hearing was the subtle distortion I'd gotten used to. Suddenly it dawned on me that my speakers sounded cleaner and clearer, and I was noticing things I hadn't heard in my music before. Different textures, more clarity and just overall cleaner and clearer across the whole frequency range. It was like getting new speakers too.
Everyone underestimates what good subwoofage can do for a system until they hear it. I swear I need to just copy paste my sub spiel for these threads, I type it so often.
Here's a post from someone who recently upgraded subwoofage who says it made his whole system sound better with some description of how.