There are still a number of 'bots from China hitting the site. I'm looking into a software firewall so I can block them at the server level before they can get to the site. Not sure if that will help or not. But I'm not jumping at making a large change to the server if I don't have to.
We are having the exact same problem Rob.. You can limit the # of crawls through the Robots.txt file that will help.