As of now, strength is not modifying the carrying capacity.
I have 3 dupes :
- First has 5 strength and can only carry 200kg (instead of 400kg due to his strength)
- Second has 5 strength and can only carry 200kg (same as first dupe)
-Third dupe has 6 strength and "buff" skill (so 3 + 3) and can carry 440kg
I can only see that difference between the 3 dupes. There are other differences but it's the only one that I see that can make a difference in the carrying capacity algorythm.
I hope you will address it as soon as possible as it is very crippling to only carry 200kg per dupe...
Create dupes with strength and one with "buff" skill. May need a save. Quit game. Start game and then load save.