Tank Destroyers were and will always be the Snipers of vehicles. That is why they lack armor but have great speed and firepower. By making a panther range = SU 85 you will simply destroy any potential the SU 85 has. Then 100% noone will even bother playing Soviets since there will be nothing left to play with....
Lack armor LOL .... what weed so you smoke ? Su85 has armor which rivals the panther. The problem is you want to keep your easy mode su85 exploit.
At 115 fuel its so cheap it becomes a spammable unit bad enough being OP. For the record Panther is SUPPOSED to be an anti tank vehicle so when its 50 fuel more than a SU85 I expect it to at least have EQUAL range.The Tiger at 260 fuel has LESS range than a 115 fuel SU85.
So basically Soviets have a non-doctrinal elephant , has faster reverse speed than most German tanks forward speed , can gib infantry squads from afar and not to mention has a super amazing forward sight ability allowing it to scout more than even a sniper.
The fact that you think that M3 got a "nerf" when if you read the patch notes it actually got a slight buff is testament to how much you are not interested in balance but more in making sure your favourite faction is buffed.