Hmm, I don't think SU was near collapsing. I still had more IC than you put in the production, and had much more effective use of IC than you did (thanks to UK supplies), and an army larger than yours. When would I have lost 100 IC more? A couple of months? Never? Sure, you had the upper hand, but I still had enough to hold on. Magnitogorsk would have been difficult to take, not to mention your logistics distance penalties, zero manpower etc. And even if you did, what then? Your Western Front was close to collapsing, OTOH

Still, we will never know ...
And yes, I made a few mistakes - and I'll gladly repair them as the USSR next game

- but so did you - if you wanted to attack early you should have prepared for it much better, I would have been dead in 6 months.
You used paras to break an encirclement at least once, that I remember.