the Polish-Lithuanian commonwealth was still in control of her territory that includes most of what is now Poland, Lithuania, Kaliningrad, Belarus, Western Ukraine, Bessarabia etc.
The only "carving up" was the Germanic lands and the real victors were the Swedes. The French just got a divided Germany (which was a big win for them).
Finally, these two states didn't "pretty much killed most of the people in the German speaking areas." -->Neither France nor Sweden can be blamed for what the Germanics did to themselves
Again, the population loss, while huge was not "most of the people" -- the reduction in population is estimated at 15% to 30% including deaths due to disease and of course the scorched Earth policies etc. The Peace of Westphalia did not give the concept of the nation-state. That was more formed due to the French Revolution and in the middle 1800s.
until the middle 1800s, you could be "French" or "Russian" or "British" and speak "Breton" or "Polish" or "Welsh", but by the mid to late 1800s there was a drive to stamp out this and make the states one in language, etc. etc.
That quickly gets you into the sort of math that shows a loss of MORE THAN HALF the population.
If you rely only on the infrequent censuses taken in the region you'll get different numbers. The ratio tells the story.
When the American colonies were liberated in the 1770/80 period the standards set in that corpus guided the minds of the writers of the Treaty of Paris.
By the mid 1800s (long after the French Revolution) I doubt they even thought all that much about Westphalia anymore. Nations were nations!
You really have to go back to the 1600s for the full sovereignty idea ~ 200 years later it was certainly in full flower ~ even Latin American "nations" had arisen out of the wreckage of the Spanish Empire (and that, itself, was a guide to the 1960s when the Brits and French Empires were disposed of like rubbish).
I think what's happening here is you slipped a cog and missed that ever critical "8" when you meant "6".
I'm still trying to figure out when the Kalmar Union reasserted itself in a "weak" Norwegian-Danish whatever ~ at any time AFTER Agustus Adulphus ~ just not in there guy!
Once DeLaGardie reorganized the Swedish Army there was no turning back ~ the Swedes kicked butt everywhere they went and there was ONLY the Swedish Empire in the North, with vassal states in the South.
Too bad they wasted it in the late 1700s, but there you have it.