With only 40 ppm of hardness (a teeny shade over 2 gpg) I don't know why you have a softener but...
You should buy yourself a test kit for hardness, iron, pH at least and see how much iron is getting through the softener.
Have you mixed up a solution of iron out in a gallon or more water and poured it into the water in the salt tank and done a manual regeneration? If not you should. Use a dry measure cup and 2/3 cup. When the water in the salt tank goes down about an inch, unplug the control valve and put the softener in by pass for like 30 minutes. Then plug it in and put the by pass in service and let it finish the regeneration.
There are many choices of minerals for an iron filter...





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