Viipuri:
Nice! 
And it's really great to find again our armored trains!
Guess what? I think that this scenario is now (a little)
too easy...
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For me at normal difficulty (
as usual, so at level 3):
Around the 9th turn, the Soviets begin to seriously lack some steam, at the end of my 12th turn the remaining Soviets were on overall in really bad shape and the scenario was finished just before the turn 17, with all Soviet land troops having been like disintegrated and their airfield taken! (
Fortunately, it's not required, in this case, to wait until the end of the 36th turn!)
Strategy:
I've decided to use the bunker line and to defend it by concentrating all my troops behind these bunkers... I pushed on my left flank while trying to hold in the center and on my right flank. My left wing managed to decimate the Soviets in front of it and to make them really retreat before pushing forward, while the others managed to hold! Then my left wing has continued to pursue the remaining decimated Soviet units and has massively started to move southwards to seal off the day!
Several experienced ski troops have gone down (
of course!), but were reformed just after and directly deployed not far away from the front, I mean around the town in the center (
I don't remember its name, though)...
*******
As said in previous scenarios,
the Soviet artillery tends to stay put even if it has no target - and thanks to our recon planes, it had often no target at all, all troops staying carefully at least just out of range - except when rushing towards them to deal with them once and for all! To increase the challenge a little bit, this artillery should definitely advance when seeing no target... two or three hexes more would have been largely enough to fire at least on some bunkers...
*******

What about trying to force, if possible, the Soviet artillery to move forward when it has no target and when it's fully organized (
seeing the amount of shots fired 
)? It would also be more coherent with an offensive stance...

I wouldn't shave off any turn within this scenario, for the Soviets should have the possibility (the material time) to reach Viipuri...
The Soviets DO NEED some help, so there is another idea:

What about adding an event around the turn 7 or the turn 8, something maybe like this:
"
Semyon Timoshenko is displeased because the fierce resistance of the Finnish troops slows down too much the advance of his Soviet soldiers, so that if he does nothing the city of Viipuri will probably not be conquered in time.
As a result, Semyon Timoshenko has just decided to go himself into battle with all the last reinforcements he has managed to muster."
The picture isn't a problem - we have already one of him!
We can imagine another armored recon car, or maybe even a tank unit, with his name, plus several infantry units (mainly regular infantry, maybe even together with some guard infantry)... as well as a new sec obj to, let's say, "deal with him" or "kick his ass" (
if I may say so) or something... (
He could maybe escape on foot after loosing his transport mean, as another before him...)

Well, even if you decide not to involve him in person, this event (
lightly modified accordingly) could still be used, as well as, most importantly, the Soviet reinforcments...
Together with a little boost of flavor thanks to the event itself.
