Originally Posted by FabilaJ
part of my experiment was to see how much alc/vol would be added to the beer if I used an extra 2 lbs of grain
So just use some brewing software - you can answer that question in a matter of minutes.
Assuming you are merely STEEPING grains, and not doing a mini mash, you are not likely to be affecting your ABV significantly (or at all) however - generally steeping grains are for adding character (body, mouthfeel, color, flavor), not fermentables, as a basic steep won't convert starches. If you want to tweak the ABV you should either tweak the extract amounts, or look into partial mashing.