I don't think we can expect to achieve the same results as we get with other sim's; it's just different. Every title has it's own recipe and flavor consisting of different ingredients and proportions.
I agree, PC2 FFB is not a "Set it and forget it" one; I have pretty good FFB in quite a few cars but, I still don't get the same satisfaction from driving them and that suggests that the issue may go well beyond FFB. It's just something that's hard to put my finger on, and it may be a combination of things. The closest we may get to PCars2 nirvana is likely to be by following Jack's recommendations regarding FFB. I've reached the point where I'm confident no amount of tweaking FFB is going to provide everything I'd like to have in PC2. That's okay; other titles have their strengths and I'm fine with a diverse playlist.