Nope its an issue with the 8830 WE. Only thing you can do it set your profiles to Loud, and try to track down some louder MP3s to set as your alert tones.
Ringtones is somewhat of a problem to blackberrys in general, but i make my ringtones from phonezoo.com , but when I upgraded my os to 4.5.0.77 it got louder, but it's still not a complete update so there's some bugs here and there.