That's pretty much how mine works, I'd suggest doing it like this so you can see the cooldown on Bane:

/macroicon "Bane"
/ac "Bane" <t>
/pac "Aerial Slash" <t>

Also unlike many macros where you can get around a wait timer with a double press, i don't think that's necessary with a single action / petaction combo- I just did some experiments to confirm that. With Garuda there's always that wait for her to stop auto attacking and kick off Aerial Slash but it goes off the same with a single button press. I thought that perhaps it was just if using an Instant and with a cast I'd have to double press but confirmed otherwise on Scholar with a Physick/Embrace combo like the macro above: right after the Physick cast started on my part, Eos kicked off Embrace and they casted simultaneously.