Need help Understanding PH?

I just want some clarification. PH of the nutrient solution versus the PH of the medium. Currently I am using Sunshine Mix #4. Additives are Dolomite Lime and some bacteria. I do use well water. PPM sits at 200. In my area calcium and mag are in the water. I use FloraNova by GH as my base. So my questions are these

1) Is it a bad idea to add lime to my mix if I use well water?
2)Where do I set the PH of my nutrient solution, so my soil ph is stable?.
3)Why does the solution go in to the plant at say 5.9 and come out lower?

Anyone other simple explantions about the relationship between soil ph and nutrient solution ph would be appreciated.

Thanks
BC

dolomatic lime will raise ur ph, you can use this
6.3 - 6.8 is the idea range imo
because the ph off your soil is low, try flushing then watering with a 'ph-ed' solution

hopew this clears up for you!