I have a 'Defensive CD" macro that I spam in between the combos.

macro goes like
/ac "Rampart" <me>
/ac "Foresight" <me>
.
.
.
.
/ac etc (i basically squeezed ALL my available defensive cooldowns into this macro) so that one single macro allows me to execute all defensive cooldowns.

my fights typically go like:
fast blade > macro + macro > savage blade > macro + macro > rage > macro + macro

i recon it would be a lot more "effective" to use the abilities based on situation, but after a few dungeons run i realise the most important thing we need to do is to keep hate, which requires us to go through the combos religiously, and the best time to pop any other ability is in between the combo attacks since the combo attacks simply cannot be jeopardized or we will lose hate almost instantly.