Fixed
If you wanna continue twinking, try this addon instead http://www.ownedcore.com/forums/worl...ost-5-1-a.html (Warscrub Gulch - XP on WSG post-5.1)
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step1: Use BGTwinker addon to enter leveling bg.
addon link wow-bg-twinker - Join XP-On battlegrounds with XP turned off - Google Project Hosting
video guide
BGtwinker Guide - YouTube
step2: Once you are in bg with xp-off (after the loading screen) , then disconnect yourself as soon as possible (must within 5s). The DC part is key to this exploit, you can dc by unplugging your network cable or disable your internet connection in Windows Device Manager, but do NOT use any ingame mechanic to dc, such as alt+f4 or dc macro etc (btw I use Comodo firewall, it has a button to temporary disable your internet connection, really convenience)
step3: Relog your toon, the system will not kick you out from bg now, have fun