Tires are usually the cause of this. What front tire are you using? Are you using the stock tires? First thing I would do is go back to NEW Stock tires, front and rear.
Suspension settings can affect a wobble but going to new forks and changing springs is ridiculous. Not required and will not always solve the problem.
Just about every dual sport bike I've owned has had a bit of a wobble depending on tires, speed and sometimes suspension settings. XL Hondas,
XR Hondas, KLR's, DR's, KTM's.
One thing to try is to relax your grip on the bars. Death gripping the bars will make a wobble a worse or induce a wobble.
Double check your head bearing adjustment. (I know you checked them ... but are you sure the adjustment is correct?) Make sure they are not set too tight or over packed with grease.
Suspension: Increase front pre-load a touch. Might help, no guarantees.
But really tires are usually the key. Most 50/50 tires are pretty stable, but knobbies like TKC's, T-63's, MT-21's can get the front into a wobble at certain speeds on pavement. Most times it won't go into a tank slapper ... but for peace of mind you need to reduce the wobble or make it go away totally.
Good luck. Let us know how things go!
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