Thanks for your response Adrian. I have a 3000+ dollar rig with a GTX 690 in it and it runs rF2 without a hiccup. So system performance is not the issue. I'll try recalibrating the wheel again. Every update worked fine in the steering area until 146. I did not play with Logitech Profiler for my G25 either and change any of the settings. Must of been something the update did to the sim settings. Bizarre that it happened to me, but I don't here any others complaining.
It is unfortunate for you. Just as a reference, my G25 was completely untouched and actually feels very good. I did do a full install and then put my saved packages (9 gigs) and my saved userdata file back into the fresh install. Anyway, hope you get it figured out. Nothing worse than trying to fight steering settings. Really ruins the immersion.