You really don't want to be pHing your nutrients when you're in soil, especially when you're trying to change the output pH. The output pH is going to be determined more by your feed level than anything else. So if you don't like your output pH change your feed level. The minute you started messing around pH in your feed you increase your risk of having an actual lockout dramatically.
Many growers use smaller pots so they can feed and water more frequently thereby getting more oxygen to the roots and growing bigger plants. What your nutrient supplier said only makes sense if you're not using nutrients.
Really looks pretty normal for a plant in flower, it just started to go pale a bit earlier than most probably just hungry.
You're correct that you want to keep an eye on the new growth and some of the mids leaves to judge whether you've got the right nutrient mix. Those old leaves will just continue to yellow and fall off.
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