OK, I misunderstood how this works. PsychoPy should be drawing at 180 Hz at a software level, even if the signal that gets sent over the cable is actually going at 60 Hz, using the magic of frame packing (I’m not sure if it is capable of running at the other frequencies you mention, as it is just doing simple RGB channel separation, which allows a multiplier of × 3 only).
But having said that, I’m not sure that a six year old MacBook Air is ideal for this. Airs don’t have a discrete graphics card, just Intel integrated graphics. So it might struggle a bit. But the only way to tell is to have physical validation of your output, using a photodiode or similar, as in this thread: