The issue is not as much as putting the 2S38 in a higher battle rating or nerfing it but more of finding vehicles to balance that battle rating for each country. So far there was only one vehicle that would be a good comparison is the STRF-9040C which has a higher penetrating auto canon. The Puma would be better compared to the M3A3 Bradley and the BMP-2M due to its lower penetrating auto canon and its speed. Most of the vehicles that might be a good comparison are either higher tiers or not in the game. In most battle ratings each country has around the same type of vehicle in each battle rating such as the US Bradley and Russia having the BMP-1 and BMP-2 or Germany having the Puma and Marder’s. Same could be said for medium tanks and heavy tanks but when we come to the 2S38 there’s not really any vehicle that has the same capabilities like a high penetrating auto canon with AA tracking with a large amount of ammo.
Sure there’s draw backs like the gun depression or its armor but a good player can take out a large chunk of a team out by themselves without even getting touched and there’s not many tanks that can do that. The biggest issue I see is if you were in a normal MBT and you missed you’re pretty much dead if you’re in a open space but the 2S38 has such high pen that if you miss you can just keep shooting, its like having a MBT gun in full auto.