I just use 3 macros + ISboxer keybroadcasting.

/assist jinkobi
/follow jinkobi

Just put in your main's name. I never use focus just my mains name and it's worked out just fine for me. If you switch masters all the time then you might run into problems but who does that?

Then a macro to equip my weapon after the mounted combat.

What I also do is have my first 3 buttons above the main bar on the bottom left bar set the same on my slaves. That's where I put the macros.