If you want to play a DD so much, play a DD.
Just don't forget, tanks are there to get hit and make things easier on the healers and DDs. That's our role. It's nice if you can put in the damage when you need to, but that's the role of the DD's. And they will always be better at it.

If you have a party that knows you and can deal with it, mix it up all you want, but if it's with new people, you're just going to make it harder on everyone.