OK, after posting, I found this Conversion formula
Basically, it's saying that
Potential Alcohol (% vol) = glucose + fructose (g/L) ÷ 16.83
So if I used 1.37 lbs of sugar where Yooper used 1.25 then I used 14.4 g/L more (if my math is right). Then using the formula, my alcohol should be about .85% higher than Yooper's recipe. For the batch I used 3.5 cups it would be about 2.46% higher. Does this sound reasonable?