My understanding is that they changed it from Dort to GHE to open it up to all of the pale colored, balanced, export strength beers rather than just those from Dortmund. So therefore the water profile could change from region to region. I could be wrong on that though. So its going to depend on what your judge thinks it should be, and/or what the perceive in the beer. I went the route of less is more. Just enough Ca to make the yeast happy. Only a touch of Mg and Na. And on the low side of SO4. When my grand master tasters reviewed one did not mention minerals at all, as in he didn't deduct points for its lacking. The other said he detected and enjoyed the low minerals. Minerals, like spices in my opinion, are easy to over do.