Is it a practise to intentionally lower the pH of your water to prevent nutrient uptake?

Not sure if a situation would ever occur where your plants are too saturated with nutrients. Could you still water with ~5 pH so they have something to drink but don't uptake nutrients?

No! That’s asking for trouble.

Raise pH to lower food uptake!

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Whisky the thing to do is to flush your pots with Ph adjusted water until you get a good amount of run off from the bottom of the bucket.

Get those extra nutes out of there.

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Are your plant's leaves burning?

Pics?

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