Now we know the only Leader rolls during combat are these affecting the final CV. We also know that I have managed attacks to get with best leaders/shortest HQ ranges a maximum of ~152% of CV (so Starting CV 100 ended as CV 152 with no lost/hit elements). This properly matches with Joels stated x1.25 which can be applied to each group of Ground Elements twice, which gives 156% CV. For the sake of easing things I always assume hat all Elements pass their checks.
Now there are special rules on top of all of this.
The one that's part of this Thread is the special winter rule set for the Germans. This one supposedly should only affect the defensive CV, it is not mentioning the offensive CV, nor the pre-battle-DISruption Germans suffer during fighting in heavy Snow (btw. all these special rules only are applied in Heavy Snow).
Okay, now comes the shocker.Living Manual 1.27, p.192 wrote:Errata: Undocumented rules
Axis units in heavy snow have their defensive CV modified as follows:
Dec 1941 - /2
Jan 1942 - /1.5
Feb 1942 - /1.33
This is reflected in the CV values shown on the map.
In addition, once in combat, there are admin and land combat rating checks
made. For each failed check, the defence value is modified an additional time.
So a unit in Jan 1942 in heavy snow can have their CV divided by 1.5 up to 3
times if it fails both checks.

What this Thread EXCLUDES is/are:
- German defenses
- Hasty Attacks
- enemy SURRENDER/SHATTERED/extreme ROUTs and all kinds of results leading to tens of thousands of CV or causing the defender to end with 0 or close to 0 final CV.
Observations made.
When testing pre-battle Diruption during Winter 41 I found that somehow the final CV on average seemed to pretty often increase (compared to initial CV) compared to non-Heavy Snow fights.
Further, the usual before stated 155% CV increases were exceeded by different magnitudes (180%, 270% 350% ...). Following 2 Battles with such extreme final CV increases from "live" PvP games (I can provide more). Additionally to these two I looked through 2 AARs on Discord with players posting lots of combats and in their AARs and I made the same observation. Attacks by Germans before/after Winter 41 (Dec,Jan,Feb) and Battles not in Heavy Snow during this three months will never show such increases in CV.
So something seems off. Would be nice if this could be investigated.
I will continue the post with lots of guesswork, for the sake of your brain health I suggest to not keep reading!!!
CONTINUE READING AT OWN RISK!
READER DISCRETION IS ADVISED!
Alright, so the fact that we get above 300% CV increases suggests that the actual modifier may be even larger, since lots elements during combat do not contribute to final CV. One that comes to mind is 400%.
As said, this can only be observed in attacks by Germans in Heavy Snow during Winter 41 (show me similar Results in other Weather/Dates if you have any !!!).
The normal maximum should be 100CVx1.25x1.25=156% (I often go with 155% for the sake of ease).
Now as mentioned before, a possible number could be 400%. The question is how these could be achieved.
What stood out to me is that the ERRATA (posted above) uses "/2" and not "x0.5" as modifiers, this is no proove but cought my attention.
As before said the Winter Rules only mention Defender's CV, but I will try to include the numbers/modifier we have to "prove my point" - if I have any, I was called chasing rainbows in the past, so it may just be me having rainbow-fever-dreams <3 .
Variant 1:
Assuming that Winter Battles (Attacks) are using the same twice x1.25 rolls and additionally using the "Winter penalties" in some weird way, we can make the calculation of: The 0.625 are derived by dividing the normal 1.25 modifiers "/2", so 1.25/2=0.625
(I've told you to read at own risk!

Variant 2:
This one is the less brain damaging variant.
This one simply assumes, that the stated "/2" was intended to reduce CV, but instead dividing by 2 or multiplying by 0.5 it divides by 0.5. This one can be interpreted by assuming the passed roll uses "x1.25" and the failed roll uses "/0.5", so the follwoing example would be 2 failed rolls (for all elements - if it works like that). ...or there is some completely different shenanigans going on, brain-damaging content ends here.

Alright, that's it.
As said, if anyone has similar attacking results under other circumstances (weather/date) post them here in the Thread and I am proven wrong, which I wouldn't mind. Maybe then my sample size was too small looking at guessed 200+ PvP combat results from T1 till T55. It may also be related to pre battle DISruption, that's also possible, but quick testing gave no obvious results, while Heavy Snow did.