I think, in the way of tanking and holding aggro, you need to have more points in vigilance and Defense.
2 points in focus is a waste imo. Think of a spec of around 17/24/0
In the vigilance tree, you need Unremitting 2, because of the immunity, but many of the points you put into Vigilance will help with DPS, you still get the main points from the Defense tree in this build, but more dps which helps control aggro.
just my 2 cents.