I would be happy to help! My buddies at the local brewery helped me with this spice schedule, but just be forewarned I didn't measure these out with a scale or anything. One thing I think that both they and @brew_cat emphasized and made a world of difference was the use of fresh spices!
15 mins - a knob and a half of fresh ginger, including skin, ground up in a cheese grater
- about a quarter, maybe a little less of a 12 oz bottle of Grandma's brand molasses
10 mins - 2 sticks of cinnamon in a muslin bag tied to a string and tossed into the boil
- about a teaspoon of whole cloves, ground with a mortar and pestle
- about a teaspoon of ground nutmeg (i couldn't find fresh, whole nutmeg)
5 mins - about half an ounce of Willamette hops
Molasses, according to the guys at the brewery, will definitely dominate the taste of the beer if you use it too late in the boil. I might even use it earlier next time, but at 15 mins I got enough taste of it without being overpowering. Hope this helps!