Profile of Vipper

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If we start peppering the game files with random rules, it will become an intractable problem for somebody to pick up what we have left to even make any meaningful modifications.
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That's a no-go.

same should apply to damage of M36/FF which is 200-280 instead of 160 as it is equally is not more confusing...
And it this weapon only that I suggested target tables against the limited number of super heavy vehicles (elephant,ST,JT,KT,Tiger).

One cap skip the use of target tables by lowering damage to 160 lowering accuracy and buffing reload.

Before the buffs to TDs the Panther was not easily counterable. The Allied factions (pre-UKF) didn't have the stock tools (infantry AT and reliable TDs) to deal with it and had to rely on call-ins. The problem is that its lacklustre offensive capabilities weren't addressed when it acquired counters.

Or that its counters Firefly/M36 can bypass its defensive virtues. Increasing Panther DPS will leave PZIV facing the same problem and will help Panther little since it will still be out-sighted, out-ranged and out-gunned from heady TDs.

As to your suggestions:
1). .. and probably wouldn't do much anyway (due to penetration and armour values). "Promotes blobbing" is an issue with price and availability rather than the weapons themselves.

I would do much both vs the Panther and vs PZIV...
Effeteness is part of the problem also and that is why piats deflection damage has gone down...

2). I agree that the Su-76 and Stug could do with a slight penetration reduction to better encourage the use of heavy TDs but the Puma has horrific penetration at long range (50% against Allied medium tanks). The SU-76 and Stug would be better served by a fairly constant penetration profile (perhaps 180/170/160?).

I left Puma out of it, since it is well balanced in that department at least, I included M10 since imo should perform more like the Puma as cheap flanker, a high risk high reward unit...

3). Target tables for specific units make the game harder to learn and balance and also reduce authenticity. Should we give the kubelwagon, UC, M3 etc. partial immunity to AT weapons because they aren't useful in late-game? It would be better to use accuracy and target size rather than target tables. The heavier (damage and penetration-wise) the gun, the lower its accuracy and turning rate should be to prevent it from completely obsoleting units (the problem with the Tigers, IS-2, Comet, etc.).

Target tables all ready in the game, most hand held AT weapon weapon have them, AVRE has it...
The problem with 200-280 damage from M36/firefly is that they mess with number of shots needed to kill medium and light vehicles for no particular reason.

All 400 HP and 800 HP vehicles are affected and also all 640 (applies to 800HP also at vet3)from the 2 shots 2 (1 at vet3) tulips combo in 8-6 secs...

4). Better to go all the way, balancing accuracy/target size for all vehicles. It would help fix the problems with light units being balanced entirely around shock value.

I see no problem with that. Imo armor/penetration should protect heavy/super heavy vehicles from lower tier units while accuracy/target size should allow some chance of survival to medium light from 60 range TDS and Super heavies.

Actually sniper incendiary shot could be fixed to kill only 2 models, it would still allow the Wer sniper to counter the Soviet team, without being OP vs infantry/support weapons.

That's a problem with the Panther, not with tank destroyers being too good. Tank destroyers need to destroy tanks. If you take that one simple purpose from the StuG, you cripple Ostheer immensely.

Imo it is actually a problem of the TDs and not the Panther. The Panther was in good spot before WFA and some people where even complaining of it being OP.

So what happened that made the unit UP since it has seen little change in stats?
Two of it's advantages went down the drain, Extra HP and Armor had less value than before.

Extra HP become irrelevant when M-36 and Firefly where introduced and took it out in 4 shots.

Armor become of less value when bazooka and Piat blob did deflection damage and when M-36/firefly/su-85 got enough penetration to punch thru its armor, out of range, reliably...

My suggestion is not to nerf Stug. My suggestion are:

1)Remove deflection damage of hand held weapon to medium tanks including Panther
Reason: promotes blobbing reduces the effectiveness of medium tanks vs infantry.

2)Reduce the penetration of "medium tank" hunters (su-76/Stug possibly m10 that should be closer to the penetration of Puma)
Reason: This units do not need 100% penetration at max range to be effective vs mediums and are currently far more cost effective than their heavy brothers (Panther ,Su-85) both vs mediums and vs heavies. The change actually promotes teching.

3)Reduce damage of M-36/firefly to 160 and use target tables to increase it vs Super heavies.
Reason: stop Fireflie's alpha strike to medium, makes 800/400 units actually benefit from the extra HP.

4)Reduce chance to hit from 60 range units vs medium either by reducing accuracy or size.
Reason: Gives some room to sorter range units maneuver.

This chances imo would help the Panther,PZIV, Churchill and Kv-1 by giving them some breathing space, and establish the concept that T3 units are better at fighting T3 units while T4 units are better fighting T4 units or super heavies, and give an actual advantage when teching to T4...

I have also noticed some weird behavior in live and patch from the UC. Many times it enters the map in reverse and also uses reverse even when order to move very far away...