It appears that's the nature of the beast, some do it others don't.
I've spent considerable amount of time and effort trying to eliminate this "clunking".
Started with wrapping the long tank bolt with insulating tape - no joy.
Drained, flushed and replaced fork oil with recommended 10W - no joy.
Drained and replaced it again with Motul 5W slightly increasing air gap - 90% result.
Front forks are softer now, dive a little more and the clunking is gone but for the harshest speed bumps.
I have come across a similar thread on VFR800 forum, the explanation given there makes sense. It's to do with the fork tube bushes, acting as spacers inside the fork leg not fitting snugly.
If I were you, I would check head stock bearing, tank being loose and wheel bearings if OK, I wouldn't worry about it for now, but lighten the oil when doing the forks in the future.