94f is pretty warm.
I hear ya on the cheap soil meters…
6.5 ph is good…
I still think your girls would like a big drink less often than smaller more frequent drinks.
I left the quotation marks spaced in my post above to make it easier to copy and paste into the search bar, there’s a bunch of threads about this. See if you can find one which aligns closely to your situation and what the resolution was.
Try this one, he mentions his got better after switch to watering every two days.