I'd start a little light on the foliar spray and see what happens. As you probably already know, some strains will like it more than others and tolerate more frequent applications.
From the same well in just a matter of days, I've seen ph ranges move around some...enough to cause problems. Never a bad idea to check the water ph on a regular basis. While improper ph of water isn't always the cause of a problem, crossing it off the list of potential problems gets you closer to solving plant problems.
The chart below might be helpful. It shows the preferred range for uptake. Phosphorus in particular seems more finicky about its preferences.
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