The first macro is your opening spells.
Hunter's Mark and Serpent Sting.
It also fires off Rapid Fire at every cooldown.
After that Steady Shot is +Focus, and will never get stuck.

The second macro fires off your cooldown effects.
And can get stuck often, but when it does the first macro fires off a Steady Shot.
At every opportunity Explosive Shot and Black Arrow both fire off.

So overall, you get ES and BA on every cooldown.
And then HM/SS initially, with SS whenever ES/BA cannot fire off.