I mean, it is a if there is a "Chemocline" to your water? I am always hoping someone on this forum whose discipline is more closely aligned to your issue(s) chimes in
I would wager good whiskey your issue is CO2 related but not really, really good whiskey. More like off branded 5 star...
If you ever do consider furthertesting, Alkalinity, CH and GH would be the parameters to test.
