Do you have a mineral report for your water? Its hard to suggest what to do without knowing what you have. It also depends on what beer style you are trying to make. How are you measuring your pH?
I haven't used 5.2, and never will. Its too easy to get your pH right without it.
I have a pound each of CaCl2, CaSO4, and MgSO4, and 4 oz of Lactic acid. Between that, and cutting my local water with distilled water for beers below 10 srm...I don't have any issues with mash or boil pH.
I strongly recommend the EZ Water spreadsheet : http://www.ezwatercalculator.com/