Not sure this will help but I had a really bad vibration on the front right wheel and could not find the source. speed and slip angle were influencing the degree to which it could be felt. After a lot of searching, including the bearings we eventually found the front engine mount to be the culprit! replaced it and all vibrations were gone! In your case though my feeling goes towards the bearings...
Let us know when you pinpoint the cause!
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