In my opinion a dublin needs a taller bowl than that. I guess you could call it a squat Dublin

Perhaps you are trying to force the piece of briar into a shape that it isn't going to work for? I find that myself when carving - I have an idea of what I want but the briar dictates what you will be able to do with it...if that makes any sense. I admire your commitment to trying to nail a specific shape though.
Also I'd just say that you've posted quite a few photos showing the pipe from the same angle, which is a bit unnecessary. Three or four good shots would be fine.
Just a few opinions for what they're worth!