I have a 2008 FLHX with a Jims 131" engine and have had some serious wobble problems. When the bike was new, I had rear steer so severe that when it would kick in when I shifted hard over 110MPH. It would go back and forth taking up about half of the lane. It calmed back down at about 70MPH. I solved the rear steer with a True Track and also tried the Baggers Brace. Both solved that problem well.
Most recently I have had a serious front end wobble that is really scary as the bike doesn't move back and forth quite as much, but it is much faster and more violent. You can just barely hold on to the handle bars. The last time this happened I was passing at about 130MPH and it was all I could do to hold on and slow the bike down. I was probably about 100 yards away from a head on with a Semi when I gained control and switched lanes.
This problem has also been solved. I took my bike over to Pocarello, Idaho to
Chop's Garage. Chopper and I took the front end apart and reassembled it with Ricor Intiminators in the shocks, Dyna beads in the tires, and tightened the neck bearing well beyond Hareley specs. Chopper was meticulous about reassemling everything. My problem is solved. The bike runs like it is on rails.
Chris