There's no need for another nerf to big transports, their armor and b/b got hit significantly quite a while ago and even the most well equipped big transport will be at the short-end of an encounter with a freighter or assault transport (and often heavy bombers, but no one flies those).
Piracy is best in a small transport, and has been for a long time now. It's good that way, imo.
A tiny edit for context: That transport nerf cut exactly 20% of 5k transport's hull and b/b count. Other big transports got reduced by 15, 10, 5 depending on cargo size, even the "previously" strong battletransports became quite a bit more flimsy as a result.