First of all remove the Name from your macros; second, target your main and simply type /focus on your Alt char. You'll have to do this every time you log in but it's not much work. Then, if I recall right, all you need is the "big button" macro found elsewhere on the forums, it goes something like:
/target focus
/follow
/assist
/stopcasting

Just press that button for re-setting Follow to your main/focus, I've only ever had the autofollow broken by the alt being Drunk and the built-in drunk system makes it swerve and ignore Follow lol