a nerf in the vet requiriment is a must.
now for the other changes : options
1)nerf the range to 50
2)reduce far pen
3)remove the barrage form vet 0
4)increase price and pop cap
Of those I'd say the far penetration nerf is my favourite. That'd let you counter SU-76 spam with Panthers, giving you a good reason to tech T4 as Ostheer.
I'd hate to see the barrage locked behind vet. I love having strong Vet 0 utility abilities on light vehicles as it gives you a good reason to build them in the late game. I wish the Stuart and Puma would get the same treatment the AEC got.