A couple of suggestions, upon visiting:
**The node icons seem like they are out of wack... The margin seems wrong, it doesn't look like they are centered. Too much extra padding on the left.
**Seems like there is a border around the forums not needed
Before.................................. After
The posts themselves seem as though the style is incomplete, or I am missing something.... (although I do find it funny in this post something is called "more stable"... hah.
I can't get used to this look....
Seems once you select, and the arrow comes up, there is a circle around it, then you can see where the border-radius is used on it... all seems odd.
The forum statistics block on the bottom, personally hate it. I wouldn't trust an add-on that came from that crew as it is.
The only other suggestion I would give is to somehow reduce the amount of scroll you have from all the forums. A lot of empty or very small posting in quite a few of them. Would perhaps be better to condense them somehow.
Your decision on software was the correct one though, so you have that as a great start. I'd suggest having the finer points of your theme corrected by the one who converted it over (I think it was @
Matthew Hawley ). It seems to have been rushed, which isn't fair to a customer. You have an excellent start, stick with it.