Yeah I still haven't experienced the match-up first hand, but from what people are saying it seems like simply reducing it's penetration so it doesn't chew through 222s so quickly would allow ostheer to have a way of countering it proactively rather then only being forced to be reactive with infantry AT. And all the other match-ups would remain pretty much the same.
You would need to reduce the pen to next to nothing to have any effect because the 222 has really really thin armor. A better suggestion would be to give the 222 more health to make it more tanky.