It's as balanced as a PWI server's gonna get.
Anyways, as you don't give your class, I don't know what to say about TT, but in my personal case, I use my archer and cleric to do 2-3. The last boss usually kills off my cleric (he's the sac lamb in that case really, because my archer can take the hits from the last boss as long as I keep at sage sparking), but I make out okay.
Thing is, even if Aga made an instance for that purpose, what instance would he use? Other than PV, all instances that I know of needs at least 1 extra body to open. So while another instance would be nice just for teh shinies, it's not needed, nor would it help.