I wasn't able to reproduce your .6%. I did find that the scaling wasn't proportional, so the 5 gallon recipe and the 3.75 gallon recipe won't reproduce the exact same beer. I plugged in your numbers for the 5 gallon batch and scaled it down with beersmith and some of the grains were high and some were low compared to your 3.75 gallon version and my beersmith scaled 3.75 gallon version.
When I just typed in your two recipes as you supplied them, the scaled down recipe was at 5.3% ABV and the 5 gallon batch was above 6% ABV. However, I don't know if you have your batch size set at 5 gallons exactly or at 5.5 gallons. I always set my batch size at 5.5 gallons, knowing that I'll lose some volume during fermentation. I always want 5.5 gallons going into my fermentor.
Something is drastically amiss, if you're getting .6% for estimated ABV.
Screen shots might help.
