Was just looking at some stats after a recent match - which involved a lot of Churchill tanks - and discovered that the Jagdpanzer IV has the same penetration as the StuG III. Since the Jagdpanzer IV is a rather expensive and very specialized vehicle - not to mention that it used the KwK42 L/70 gun in real life (the same gun the Panther tank used) rather than the StuG's less powerful StuK40 - I think its penetration should be boosted from 200.0/185.0/170.0 to 260.0/240.0/220.0 so that it matches the Panther tank.
The Jagdpanzer isn't a terrible vehicle right now, but it's not exactly great either and I think this change would make it a bit more appealing.
It could receive a buff indeed. It's not terrible but it's not that good either