I am in the process of brewing a German Pils, and although I know it's a tricky style, I am having one problem in particular that I would love to correct. The recipe I used was apparently calculated at 70%, and I am finally ready to state officially that I consistently get 75% efficiency. Therefor, I am halfway through a 90 minute boil, and my the wort gravity is 1.050...the top end of the style guidelines (at least in BeerSmith). I don't want to stop the boil yet, though, since the wort is 100% Pilsner malt and need to drive off the DMS...and I haven't added my late hop editions anyway.
Is there a quick way to figure out a dilution to bring the O.G. down? I know that this style requires careful attention to attenuation and I don't want to mess it up by starting 5 points too high.