I wasn't aware that there's a small variation in y axis, but it shouldn't matter anway, since the margin for x and y of barrack is quite large, 1 or 2 pixels off shouldn't affect bot clicking. Can you delete configs.ini file and make sure your resolution is 860x720 and try again?
I originally wrote it to account for resolution as well (using $x_ratio & $y_ratio) but some function (especially GkevinOD's) are very pixel sensitive, so 1 pixel off would make it unusable. If you noticed the bot can still click on basic button on 800x600 but you need 860x720 to run properly.
I've included the reg file to change to 860x720. Just run it and restart BlueStacks (right click on BS's icon in taskbar and click Restart)
http://www23.zippyshare.com/v/59243704/file.html