6.2 is in the ‘happy zone’ for our uses.
Most municipal water supplies jack it up to high 7s to low 8s to prevent corrosion issues with pipes. You usually do not need CalMag for these sources.
So I’m guessing you are not on municipal water? (based on pH). If so, some Calmag might be in order. You really have to ‘work at it’ to screw up with CalMag so you are on safe ground fooling around with it as you see fit.
If you are on municipal, check for a water report on-line, for your area. That will give a reasonably good breakdown of your source and what they are using (chloramine vs chlorine).
Cheers
G