some games don't have much ffb in the center. It's not a dead zone, it's just that the ffb only kicks in when you turn a bit
Thank you for this excellent and detailed question.
You mention experts discussions between mclarenf1papa, kyuubey, stereo etc about what needs to happen to be "realistic", I have a lot of respect for those individual, they are helping us all reaching a more realistic simulation.
I believe that FFB, in its present stage, both software and hardware is at best a compromise. So an ultra realistic approach, although it should be the goal, might end up, at this point in time, in an experience more frustrating than fulfilling. My goal is immersion, what makes me forget the hardware and believe that I am actually driving a car, is my real goal. The CSL DD is a game changer, like VR, for me in my quest and I now believe that DD is the way to go.
You mention, "not much ffb in the center", this is the first thing that shocked me, in AC, when I started using the CSL DD, very light, no resistance what so ever, in comparison to what I was experiencing on my Buhler modified CSR Elite. Will it be an issue for you, I don't know. Past the first shock, I got the {NDP} Natural Damper to 40% and all is good now.
There is no fan and no noise and no heat generated by the CSL DD, that is amazing, dead silent and feels like a rock.
From my experience, the feeling of immersion with a DD, in my case a CSL DD, is a huge improvement over my previous experience with other type wheels.
To me, the smoothness, speed and detail are on a different level and make all my SIMS better SIMs.
To close, CSL DD to me , but I believe about DD in general, is so different, that we all need to understand that, at the beginning, driving with DD is unsettling, As in any compromise, you gain some, you loose some, in this case some things familiar and comfortable, but overall the gain are so nice, that once you crossed the threshold, their is no turning back.
I hope it helps, I recommend you go for it.