Considering I went through the entire inventory of empire ships checking and changing ship classes to suit my needs, one little error is pretty darn good! One other thing I saw that puzzled me was the "I" tag in special role on some ISC ships.
Also, the bulk of Romulan hawk-class cruisers are labeled as HEAVY_BATTLECRUISER, but they should mostly be HEAVY_CRUISER. Their bloated BPV that puts them up in the BCH range of 180-200 is often due to the cloak, which probably doesn't deserve the BPV boost it gives. This is up for debate, though, and changeable by D2 admins, so I don't see a big issue with it.
I noticed you've been classing the cargo pod variants of the tugs and transports as FREIGHTER. Is this by design to try to get them to show up as convoy members in raids/escorts? Since they are tagged as "R" for restricted, they may not show up anyway, but I was just curious. A group of them in a convoy mission sure would be a change of pace.