Baldu, people will tell you that it's "fine" and that it's only "us anal" people that have a problem with it.
I'm also on a C2 and 30fps modes on an OLED make me literally nauseous, if you don't see it /can't perceive it it's fine and be glad that it is so, for me though, since I got my C2 last December, 30fps modes are a no-go, and this comes.from a guy that didn't have any problems whatsoever playing 30fps games on a Plasma HDTV...
It is what it is, it's the near instant, sample and hold tech of OLEDs that exposes the shortcomings with 30fps content (and 24fps for films also).
Basically, you're either sensitive to it or not, for me, 30fps feels like a slide-show on OLED no matter the amount of in-game motion-blur.
Be thankful that you're not sensitive to it 'cause once once you start to see it you can't go back/unsee it...
Cheers
PS : 40fps modes are the "30fps of yore" for those on an OLED display, basically, it doesn't give the impression of +10fps but it makes the games supporting it feel like the "normal" 30fps that everyone is used to, it sounds weird but I can't explain it differently.