I use tap …. My tap ( Cali ) chimes in at 7.2 / 155 ppm ….. non issue . I mix up my feed or water , add a pinch of Alaska ph crystals ( down ) to range it then give it to girls. Simple.
Most municipalities have adequate cal / mag within water source. I use it in a lot of peat based mixes regardless of buffers.
But if you add water and feeds close to medium ph then if buffer reliability ( oyster / dolo / etc. ) changes ( medium moisture content overall ) then you are more assured that your addition to equation is on track.
Outside plants give no shits on tap or RO. You are only targeting the range needed to properly have elements available for plant.
Ive seen growers run distilled , bottled water and other nonsense ….. it’s a plant FFS. You want to bump growth ?
Give it full power , add kelp / EWC .
Be aware , you only trying to stop progression of issues , damaged leaf will not recover ( defol ) them if you want.
You are throwing kitchen sink at it , when all you need is ph control. 4-4-4 alone is sufficient for veg period. Lotus bloom adds nothing during this stage.