I brewed a 12 gallon batch of Kolsch today. I'm not used to my new 20 gallon kettle, so I had more boil-off than expected. My O.G. is 1.060 rather than the 1.050 I was shooting for. Do I dilute the wort down with some water to get a lower gravity for what I want to be a session beer, or should I RDWHAHB?