It doesn't need a nerf. The combo is locked behind the doctrine and it's the main use of T34-76 past the first tank stage (where it's mostly used vs infantry and light vehicles). That doctrine is a definite counter to heavy tanks with RAM as it should be. It's a muni vs fuel duel. You spend 200 muni and a t34 to kill a 230 fuel and 640 manpower heavy tank. Is it a good trade for the axis? No, but that's the whole point. Besides, the combo is mostly used vs front line heavy tanks like KT and Tiger, not the heavy tank destroyers that sit behind and snipe. Again, it's a risk to field frontline heavies vs that doctrine. You can't really complain about an ability that drops bombs in a straight thin line designed to destroy tanks.
+
+ if you dont execute it perfectly, which is hard enough, you wasted tank + muni
tbh. drving backwards is a bit easier than timing ram plane and clickimng from the right side