I think Dancook might be onto something here.

Question - how often does it change the action bars? With each key press? Or after every GCD?

If you mash the macro key, does it evenly progress through each macro or is it kind of random which macro ends up being called? I.e. could it potentially end up being FS-LB-LB-LB-LB-Totems-LB-LB-LvB-etc, or does it always execute FS-Totems-LB-LvB-LB-LB-LB-LB-etc

Cheers,
S.