I like orings. I have tried 50A and 70A. I definitely prefer 50A, 70A feel too hard to me.
I currently use red orings from imsto.
I also do not like my orings too big because the key travel ends up being too close to the bump on my browns.
I just measured two with a calliper.
The ones I like are 1.45mm thick.
The ones I feel are too big are 1.75mm thick.
Here is a potato pic to show the two I compared.