My three spokes are not adjustable I think its the bikes geometry and weight distribution because this is so frikin common and it happens on different bikes, riders, wheel's, tires, different year bikes...

 

My softail (2002) never wobbled in the 80k miles I put on it regardless of tires, wheels etc which I changed numerous times.

 

2007 Model, changed to ShotGun Shocks and a billet floating front disc, apart from that wheels standard