Balance Gepard

Hello everyone and today im going to cry about balance.
Everyone knows Gepard is 8.3 spaa and it has DM23 shell with 125 mm pen and also good mobility (65km/h) and remember it has 8.3
But in US line they have XM246 at 8.7 and it have only 65 mm pen and 48km/h it is way worse than Gepard but has higher br than Gepard.
And is it balanced?

XM246 is way more survivable

The API-T is causing more problems than the APDS in the Gepard. Somehow that tiny shell can overpressure my IS-4. XM-246 also have way better armour than the Gepard.

I have both SPAAs and I can confidently say that the XM246 is better. I have tanked a lot more shots than a SPAA should, and the Gepard only gets 40 rounds of DM23, Aswell as the XM having better radar i think