I've determined that my tap water is no good for mashing dark grains. I'm going to try cold steeping the dark grains. So here's what I'm thinking...the original recipe calls for this grain bill:
8 lb Pale Malt (2 Row) US (2.0 SRM)
1.5 lb White Wheat Malt (2.4 SRM)
1.00 lb Caramel/Crystal Malt 60L
0.75 lb Chocolate Malt (350.0 SRM)
0.50 lb Roasted Barley (300.0 SRM)
So instead, I will do this dark grain increase:
1.25 lb Chocolate Malt (350.0 SRM)
1 lb Roasted Barley (300.0 SRM)
And steep the 2.25# of dark grains in 1 gallon of water for about 36 hours hours. Then after I mash, start boiling that 1 gallon and add it to the rest of my boil kettle.
If anybody has any cold steeping experiences...I'd like to hear, thanks!