...they dive bomb under braking and pass me in corners, in places where I am committed to a particular line....
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been there, done that. an SRF came up on my left going into 10 at VIR last fall. Had to bail and I ended up off DR going down the hill sideways.

...but teh very top SMs are scary enough as fast as a midpack S car........maybe not at the Rock though, we'll see.
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Never been there, but Rockingham seems to be much more about straighaway speed and less so about cornering. Maybe you'll luck out!

In any case, I hope to see you there!