Great spreadsheet, thanks for your hard work maintaining it. I've been using it on my newly mained hunter as I approach 80 and it has been relatively accurate, which I realize is a hard thing to correctly do.
I did, however, notice one minor bug that causes IAotH to be overvalued, and especially its glyph:
On the calculations tab, under the cell IAotHShotSpeed, the speed of a weapon under the effects of IAotH are miscalculated. The formula there is: IAotHBaseSpeed * (1 - IAotHEffect). However, as I'm sure you know because it is correct in other places on the spread sheet, haste works by increasing the number of expected shots by x%, not by decreasing the the delay between shots by x%, as described
here.
In other words, the correct formula is: IAotHBaseSpeed / (1 + IAotHEffect). The previous formula overestimates the contribution of IAotH buff to white damage, and becomes more apparent when it is glyphed.
The problem can be demonstrated with a simple test by checking your weapon speed after IAotH proc and comparing it to the value listed in this cell, from which the effect of IAotH is calculated.
Thanks, and keep up the good work!