Hey Steve: Did you ever correct your shimmy. I have a 2003 with the exact same issue. A shimmy every time I go over a bump. Had wheel alignment but still there. Tires are new. Mechanic suggested struts. Doesn’t matter what speed I’m going when I drive a rough road it shimmies at ever crack in the asphalt. Like you described it’s side to side movement that is very abrupt but quickly stops when pavement is even and no sign of repairs. When I refer to cracks in the asphalt it’s those repairs that are across the asphalt versus along and have been filled but still create a bump. Please help.