T-9s are definitely in the CZs now, and they seemingly are there most of the time, and in addition to other larger ships. I have seen them in combination with both Anacondas and Federal Corvettes, so far, as I am sure that other systems aligned with the Empire will probably have T-9s and Cutters in CZs, so they don't actually replace the largest warship.
I am surprised that you ran a Size 7 shield on that beast, sure it gives more shields, but that is a huge drop off in Cargo to sacrifice that size 7 module for a shield - although that does sound backwards by saying you are sacrificing cargo for shields on a ship.
Here is my build, when I am looking for something completely different to do in game. However, since the Vette was released and my build carries an approximately 384t of cargo, I haven't really bought and fitted out a T-9. I bet with modded thrusters, shields, FSD and distributor, it makes for a much better ship.
Although, I am holding out for the Panther Clipper. Ever since I first learned of Elite I wanted that Panther Clipper when I saw it for the first time on the wiki.