So basically make them more like allied inf? Weren't you all for asymmetrical balance? But hey I have no problem if you want to add 1 extra entity if you nerf the dmg and received acc, it'll make it much easier to keep cons alive.
Okay to start;
-The Stuka Zu Fuss has more wipe potential but in a much smaller area, also it cannot deny territory to the enemy as it doesn't "saturate". It's also almost as expensive as 2 Katyusha's so idk what the existence of the Zu Fuss says about how easy it is to wipe allied things other than it takes a 150 fuel unit to do it.
-Again, the SU-76 can barrage an area preventing you from getting at it, destroy houses, ect. It's also free and easy to spam
- The LeFH does much less damage (160) compared to the ML-20 which does
300 and fires only slightly less shells than the ML-20 does. ML-20's can wipe squads far easier than an LeFH can. They also have exactly the same scatter so the ML-20 is guaranteed to hit as much but always do more damage.
- Are you seriously comparing the Tigers to the ISU? Both have 40 range and the KT is literally .8 faster than infantry. I'm not joking it's not hard to just walk away from a KT to keep your shit safe. An ISU has 70 range and can sight for itself. The Sturmtiger has a large aiming time and only has 45 range.