If you add up the levels listed in the water quality report I would expect your tap water to have a GH of about 2 (30ppm). NOT 200ppm. That water report is for a different water source than the one you are on. GH only measures calcium and magnesium. It doesn't detect chloride sodium or salt levels. You need to look for the water quality report for your town.
I have no idea if 200ppm is excessive or if it will effect plants. But the photos of your plants do show deficiencies but there are multiple possibilities. However a water softener can increase sodium levels and cause nutrient deficiencies. But a water softener should not give you a GH reading of 200ppm. For a water softener I would expect the gh to be very low, possibly 0.
I live in North Dakota, my water supply company serves the Minot area and surrounding towns. They currently use three systems, I called a few weeks back to verify specifically which system I'm on. I'm on system 1 & 2, and that's the water quality report I shared in my original post. Just to compare, the 3rd system has even lower dissolved minerals. The report is dated 2016, so the numbers could be off...but I wouldn't think it'd be this significant.
I do not have a water softener. I retested my tap gh, and again, it was 12 drops. I even tested the water from the outside spicket, and that was 11 drops. When I test my aquarium, it still goes beyond 15 drops...and never changes to a true green.
Can you verify for me that the API gh test kit only measures Mg and Ca ions? Everything I've read says, "Magnesium, Calcium, and Other ions". My test kit is new and dated through 10/2019.
I am contemplating calling my water company on Monday for additional info. Unless someone can recommend a place or company that will test tap water. The amount of sodium in the tap boggles my mind as well. I don't know why the numbers are high, or why...but I do know that for drinking water, it sucks.
I know that some people use aquarium salt as a treatment and/or prevention, and it benefits some species of fish, though I'm not sure how this compares or translates to ppm.
To sum up, I'm fairly certain it's a water quality problem causing deficiencies...either there's not enough Ca/Mg in my tap, or there is, and my plants aren't utilizing it. And something is wonky with numbers not matching up...either the water quality report is off, the gh test is off, or I'm off
Or, additional minerals are being absorbed in the water on its journey from source to tap.
Also want to add, that I love this forum and really appreciate all the help and feedback! Thank you!