Not one person has mentioned the fact that these types of plants are photosensitive.
And it isn't the daylight hours that cause it, it is the darkness or lack of the does it.
Up north you are running a race with growth vs time.
More so than folks in the south because each day gains more daylight and less darkness per day the farther you are away from the equator.
Bok Choy is most commonly grown in southern China far south of where many people try to grow it in the US.
So not only are you battling heat your are battling hours of daylight more specifically hours of darkness.
You might consider growing in the fall as suggested due to the fact that it is winter hardy and you wont be racing time because the hours of darkness are getting longer not shorter.
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