ISU 152, Su122, and howitzer type tanks weaken?

[T-34type85]

in the original, ive always like su122 to be inf support, and isu 152 as anti tank and anti arty, and KV2 just to fool around. but ive notice the accuracy of the gun is VERY INACCURATE. the crosshair in direct control is like the same, but the accuracy is like always miss? what happen!? i notice the guns are firing more directly unlike the past. but why decrease the accuracy, i mean now no one is using these tanks, except KV2 somehow.