You DO need to crank up on your front suspension a bit, wheelies or not. Stock settings on the Busa are squishy soft and riders 200+ lbs need more preload and damping. I'm 275 pounds. To get the proper front sag on my Busa (approx 32mm) I had to turn the fork preload in so it was between 1 and 2 lines showing. Damping for compression and rebound went up too. I added 2 clicks more compression and 3 clicks more rebound. Seems to work well at these settings.
Busa's a fairly easy bike to wheelie, especially if you're a bigger rider. Your higher weight raises the bike's center of gravity and it will come up better. Overall, the Busa is much easier to wheelie than a ZX11 or Triumph's Daytona 1200 which are both longer and heavier than the Busa.
Jim