Foolestroupe: That was actually helpful!
Scrump: What you hear inside your cranium is probably not what's coming out when you're singing louder. If you ever get the chance to listen to someone else whose voice gets louder as they sing higher, pay close attention. You will probably find that the high notes are a little flat. There is also a tendency to waste too much breath when singing loud. I would suggest a good condenser mike, up close and personal and practise softly.
Foolestroupe: That was actually helpful!