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GH contains both calcium hardness and contribution from magnesium. In your case:

Ca = 174/2.5 = 70 ppm (174 is for CaCO3, we divide by 2.5 to get actually Ca number)
Mg = (19*17.9 - 174)/4.1 = 40 ppm (we divide by 4.1 to convert from CaCO3 number to Mg number)

**Corrected 17.1 to 17.9
 

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I would not worry about the ratio unless you see Calcium deficiency (wrinkled, twisted, bent leaves, leaves are possibly smaller, stunted) symptoms on some plants. I corrected the calculation a bit.
 

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I was just saying if you don't see any wrong with plants, then don't worry about it. Now that you say you do see those problem, then I think it IS calcium uptake problem. I had the same problem, so I added CaCl2, helped a lot. I got pale color on 'cuba' before I dosed more Iron/trace. I use close to 100 ml trace on my 100 gallon /week.
 
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