[Wiking]

Might have to take it on the chin with this one. You're using the German ORBAT, right? Though I don't know of a solution for pushing back until 1950's, at the very least I'd think you can probably leave morale and experience alone for the most part. Even a victorious Germany would likely be totally exhausted as a result of conscription and the things it had endured, so I don't think letting morale and experience drop into the 60's and low 70's is too terribly upsetting. You could also bolster paratrooper and commando units in the formations by granting them larger bonuses to keep them in line with what they ought to be.

Really wish I knew what to suggest for the dates though, that might not be something that can be fixed.