I'll do it in '41.
As for the in-game situation, AIvAI it seems to play out pretty well. The poor GDE of the soviets makes them need humongous masses of troops to advance at all. Though to be honest, the whole Lapland area should have far less troops in it, a la EU3s attrition. Just impossible to move the amount of units I did (6 divisions) on one rail line.