Freighters should be the main smuggling ships. Sorry but the P-Trans is just too damn big!
If it were ONLY Freighters who could use the Smuggler ID, and contraband unable to be carried on regular Transports, then contraband profits could be jacked up.
Then you would have a situation that is more fitting - with large transports hauling the bulk cargo, and freighters hauling the smaller, less legal cargo.
In terms of combat capability. I still maintain that Freighters = True bombers.
Give Freighters bigger powerplants - so they can fire their guns continuously.
Give them less forward facing guns - but a better 360 degree fire coverage.
Dont give them Torp slots - instead maybe give them some Bomber Turret Slots? That way they can still shoot at larger ships - but have to fire continuously to be effective (and thus expose themselves to return fire).
So remove the fighter forward guns - and give them Bomber Forward guns Instead...