Initially, I got the tiniest buzzing at 2700 rpm, so I don't shift into OD unless I'm rolling at 55mph or better. I cruise around town - 35-45mph zones in 4th or 5th..I guess I like the way the bike feels over 3K in any gear... it makes me cringe to feel the motor bogging out when accelerating from too high of a gear.
My personal break-in thoughts...and nobody seems to have the same exact routine, but this works well for me in all motors:
I've been riding it how I normally ride from mile 0. I didn't put an artificial redline at 4k, because I think it's important to let the metal "stretch" where it needs to to allow the pistons to seat well in the cylinders at higher speeds. I rode it carefully for the first 20 miles, stop and go traffic around town so I would do a lot of shifting and changing engine speed and this allowed things to seat properly I think...after 20 miles, I rode it normally for a new bike - respected the power - smooth acceleration to 5k-6k in first occasionally. Changed fluids at 500 mph. Get any metal shavings from break-in out ASAP. After that...just ride it...and have fun.
I have 1000 miles now...and the bike and I are happy. Everything's loosening up and the motor seems REALLY happy at any RPM in any gear (at a reasonable speed). I respect the power even more now, but more comfortable running her.
Just my $0.02...