I purchased 12 lbs. of decaf coffee from an E-Bay seller for a fabulous price. But the roast is a bit light for my tastes. Can I re-roast it to get it darker or would be it better to mix the beans with a darker one to get the intensity I want? She also sells expresso decaf, but I'm not sure if that would be too dark? I usually use French roast when purchasing in the store, but I just couldn't pass up that bargain -- about a third of what I usually pay.