The pH is rather high. Have you tried vinegar rinses? It's unusual to be so high - the soft water in this country is usually closer to 5.6 or so because of the type of ground.
As a general rule, the harder the water, the more alkaline, because of dissolved calcium bicarbonate, so this is really unusual for soft water to be alkaline unless something has been added to it that makes it so.
ETA: sometimes water companies will add alkali to the water to protect lead and copper pipes which can be damaged by acidity. Id still try some acidic rinses on your hair and see where that gets you. Alkaline water can make the hair cuticle stand up, which could explain both the dryness and the tangles. Acidity should help smooth those back down.
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