The police report should be the 'be-all, end-all' on applying the poo poo to the other guy's version of the story. It'll be a no brainer that you were in your lane when the accident happened & the fact that he was sideways in the road will close the case.

When I got sammiched in Wifey's Amigo, the kid at the rear of the accident went around telling everyone that I caused the accident because I was all over the road. The fact that all 4 vehicles were in a perfectly straight line with a single point of impact from the rear ... well that told the true story.