I think the ISU-152 could do with a rear armor nerf from 155 to 110 (same as Elefant/Jagdtiger) so that it's more vulnerable to flanking Panzer IVs. And then remove the IL-2 bombing run from the commander together with removing the Stuka Dive Bomb from Jaeger Armor.
While the armor change makes sense, I don't see how the off maps are a problem.
It's the T34 ram that supercharges all kinds of AT off maps from the Soviet side. The legit ways this tactic can be otherwise executed is good mine/snare tactics against a tank assault, which is rightly rewarded but overshadowed by the sheer ease and offensive potential of ramming.
I hate blobs with a passion and less off maps means more blobs (and simcity). Not to mention they're a big part of the fun and spectacle of COH2 and there's the question of what would replace them. This is opening an unnecessary multitude of problems for no reason.