no is not
panther does not scale well late games.
need a better vet bonus to deal with allies high armor tanks.
either like i suggest, improve rear armor to give better rng against med tanks stray shots
or some hvap rounds or offensive combat blitz to pen high armor allies.
having the best core medium ingame isnt gonna be enough for you if your panther constantly gets faceplanted by AECs...
as i said at this point there is nothing the balance team can do to help you... go to the state office and ask people how to use the panther properly or better yet go to youtube...