What's happening is (and you'll probably find this) is because Baidu can't get in with the spiders/ip's they were using they are now trying a rotation of other ip's and bots, i use this mod myself although i don't ban the bots as i monitor their visits to further enhance any mod i make against them, i currently have 236 baidu bots (and 140 other bots/search engines) at my site.
With the mod in place and redirection working you'll find that these bots that you have banned will slowly drop off as they all get the message of the 301 permananet redirect to wherever you've decided to send them, your server load will lessen and things will be more normal