I started a thread for the exact problem with my Crossfire. See below.
https://www.crossfireforum.org/forum...ad.php?t=30056

I had the same concern as most of you with regard to the anxiety about driving at high speeds. As some of you already mentioned, I had problem with these sudden moves in either direction on the freeway, mostly when I was driving at normal speeds -- i.e., around 60 mph. It was difficult to justify driving any faster when these sudden moves would be more difficult to manage. I recently began playing with my Crossfire, doing some darting when there was a short stretch free of cars in front. WHen I hit 80s and 90s, the Xfire became very stable. It was a zen moment...