Don't forget that you can command your pet outside of your own casting and cooldowns. So, if you're only binding Obey to a skill, it would be best if that was your first skill cast. I don't know if /pac before /ac would get the pet on target faster.

I can understand if you're using a controller with a big premium on keybinds, but I don't feel comfortable without at lest obey, steady, place, and heel.