Mac -
FYI, Tileman's tank is a 335g... he swapped out the 225g awhile back. So he has got 50 fish in a 335... Don't want to short change him 110g

That being said, I would think you should be fine with 30 fish in your setup. You have a good, large skimmer, and a refugium and UV going... As far as filtration type things, I would probably just add another of those Jebao wp60's (maybe even 2) to up the water flow.
Even with some of the fish you already have, I wouldn't expect your Vlamingi, etc to get 2 feet long. Or the triggers to get a foot long. Dave Anderson had several large tangs in his 700 gallon tank; from my recollection the largest ones were about a foot long (and most were smaller).
I say 30 fish, because I think you would have to do a few extra things if you cross that 30 - fish window... like, more frequent water changes, add a denitrator and ozone generator (like Brad runs), etc.
Your tank is pretty much the same size as Brad's, so you could push 50 if you really wanted to. Just remember, that in Brad's tank he has many of his fish 'small / medium' sized (5" or less), and he still has to be pretty vigilant with the water changes and dosing, run a dentirator and ozone, etc.