Time to thoroughly check the front suspension, chassis etc.
While it feels scary, a harder press on the brake pedal to reduce speed will usually stop the wobble.
Spent over 18 months trying to cure mine (the kingpins / bushes etc. had all been replaced over a year earlier). Turned out there was a crack in a front chassis leg and there was rust forcing the triangulation plates away from the chassis (so losing support). Plates changed for neweer, much longer versions, crack(s) welded. Also fitted negative camber plates. With positive camber there isn't the natural damping effect, so a bump induced wobble can get worse, rather than reduce. All sorted by New Elms in the end.
