I thought it might help coming from someone that is very sensitive to stutters and frame time issues ( G-sync monitor, can see some micro-stutter at 100fps with SLI 980's and hated AMD until they fixed their issues) and I haven't seen it drop frames or stutter very often. It does happen but not nearly as frequently as you are experiencing.
Okay then, how frequently do you experience stutters on any given track? Is it usually the same spot or random?
And, is it more noticeable on some tracks while hardly noticeable on others? I suppose, to some extent, that would depend how fast you're going on the straights or how quickly the screen is panning in either direction when you take a sharp corner.