I am no hydro expert, but from what I have read it seems to me if you are adding ph down to your nute solution that is dropping your ph to those low numbers.
Seems to me you should use the ph up to bring it to your desired range then keep monitoring the ph level and add the appropriate product to keep the ph where you want it.
If the number gets too high, and ph down. If it gets too low add ph up. Simple.
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