Vibration woes again

[Davew]

Once again I'm having vibe issues with the bike after sorting it a while back.  I was getting a lot of vibes through the fuel tank. I discovered that when the small bolt at the front of the tank was removed, all my vibrations went away. I've been trying since to figure out why this is and replaced the front tank mount with no joy. I also drilled a slot out of an old mount to let the tank slide forward slightly (which seems to be where it wants to sit). This seemed to help but as soon as I tightened it up fully, the vibes were back. 

I'm at a loss, as I can't ride around without the front tank bolt attached but don't want to have to put up with the vibes it creates when it's on!  Any ideas??