Probe can sneak this same way ahead of the army to make the pylon so it wouldn't mess up the reinforcements either I think. He doesn't aggro if none of your army is below the ramp when you start fighting the two melee hybrids.
I couldn't have afforded those because I forget to always take my damn red pill to check for those few not-so-obvious resource nodes I think there's one small optimization to do on this: the first destroyer that you kill in the previous base can actually be skipped by hugging the southern wall.
