I am not really going to worry about my high speed driving due to the fact that I don't want to get arrested!! It's rare I go over 110, usually not even over 100. I will wait for the symptoms to get worse at lower speeds before I try to correct anything, if anything at all.
I exaggerated a little John, I have never got pushed over fully into the next lane. But I will be tossed around in my lane quite a bit, but never have been pushed out. And I agree with John, MUCH CONCENTRATION is needed at speeds of 120 mph, actually at any speed really, but esp. 100 +.

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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)