I would happen to agree with the others as far a #3.
I think perhaps we should be asking why does this one work better than the others...
There is nothing wrong with having a double trunk, but where this one works and the others do not, is that the trunks are at various heights.
So, with #1 and #4, you will need to either wire up some leader branches and start working on some new tops of different heights, or reduce some of the foilage height.
I would suggest the first method...
As far as you single trunk... the reverse taper that was mentioned, I personally don't think is as big of a problem, seeing that there is an actual branch there, which at least would explain why a tree might bump out there. If this branch was removed, then I think it would be a bigger issue.
The style itself does need a rethink in my opinion, and it does resemble a hedge.
I personaly think it needs less width and perhaps an inch or two more of height, as well as some layering and a reduction of some foilage.
Usually tree don't grow in such a pefectly round shape, nor have such a good life that their foilage would be so consistant. Resolve some of this and I think you will be on your way!