Increase your tab target range (max value is 50 yards)

/console targetNearestDistance 50

or add this line in your config.wtf :

SET targetNearestDistance "50"

Change the farthest distance of “TAB” to 41 yards (maximum is 50, default is 35)

/console SET targetNearestDistance "41"

Use TAB to select the target behind you to set the maximum distance of 50 yards (maximum is 50, default is 10 yards)

/console SET targetNearestDistanceRadius "50"