Grow Mediums DWC AvT new tent

Been having some challenges keeping pH stable. It's a big plant and the roots have occupied almost all of the res so pH moves like crazy. I few spots here and there from where it fell out of range overnight so I have been checking on it every 3-6 hours (including overnight) to try to keep it in range. pH swings have reduced now - doing a full res change every 5 days helped
 
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Been having some challenges keeping pH stable. It's a big plant and the roots have occupied almost all of the res so pH moves like crazy. I few spots here and there from where it fell out of range overnight so I have been checking on it every 3-6 hours (including overnight) to try to keep it in range.
Do you add ph up/down directly into the res and mix?

New dwc grower here.
 
And root pruning, is that not good to do at this point?
 
Day 55

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