I have a Brewers Best Robust Porter kit and I want to add a 1 or 2lbs of extra dme to the recipe to bring the abv to about 6.5 instead of the 5 to 5 1/2% that it is. Should o use dark dme or can I use the light dme ? I plugged the numbers into Qbew but I unsure if dark dme would be better to...