Same feeling so far in my Rockwell 6s. They feel rough for me too.
You mean rough in the 6S?
I found the same! It took like 3 shaves to smooth out a little so definitely a no go in the 6S, or other razors.
In the Karve (D plate), after the first shave, it was very smooth and very close. Still not as good as Polsilver but definitely very good!