Well, you have a fairly unorthodox spec. If I had to guess, I'd say you are very durable, but you are doing a decent margin below the threat you could be capable of. Single target threat also being much stronger than multi-target threat. I'm ALWAYS an advocate of, "if it works for you and your group, you shouldn't feel like you have to mess with it for other peoples tastes or min/maxing."
If you want to adapt it for using a 2-hander, I'd suggest just swapping the 2 pts from DW spec to Black Ice, if you want to keep Lichborne.
If you want to get more out of the trees, I'd have plenty of suggestions, but I'll only make those if you ask for them. =)