heheh, I'm a pesky mosquito! Now I think you've just barely short-changed me because the Defender stance does offer +2 STR (actually +3 at level 20 although that last point doesn't change anything). While this doesn't matter *much*, every point of DPS counts as 1.7 points of hate, so the little stuff does matter a little.
It also looks to me like there's a bug in the spreadsheet. I see STR modifiers of 19 and 8, which I don't think is possible. Should be 16 and 8 (to become 17 and 8), right? So unfortunately, it looks like the result for favored-enemy DPS is going to go down a little after these fixes.