Iron / Manganese Greensand Filter Questions

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Hello, I have a new residential water system with a well pump. 15 gallons per minute, 220V pump, 175' deep, Pressure tank 70psi. See test results below. Our local water system company suggested a 10x54 1.5 CF Greensand filter, three bags 44lb of Greensand Plus with a gravel bed. The filter was setup to Regen every three days. Ten min Regen, and a 40 min rinse. My questions are listed below.
1. Based off the test results below. Am I using the correct regen/ rinse times listed above?
2. We installed this system about two weeks ago. can you explain this? We just noticed some dark staining on the dish washer storage rack and also on some of our white dishes.
3. Can you offer any other suggestion to our system

Thank you

Iron 7.1
Manganese 1+
PH Units 6.7
Hardness 2.7
Ferrous 7.0
ALK 85
Nitrite 1.0
Nitrate 23
Ferric 0.1
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