I have known my bike since new (bought it from a great friend on here, 'bbboti', who bought it with 0 miles), and I can say it has zero issues during light turning, or any other turning . He is a big guy; I am ~180. Neither of us ever had an issue riding solo or with a passenger.
As far as adjustability, I can't imagine what you would want to change about the handling. 'True' crotch rocket owners never like to hear that the 919 has a better feel while leaning than their 'track' bikes. I didn't understand either, until I rode the 919 for the first time.
I will PM price, miles, etc.
Thanks.