I haven't had any access for a while so this has been neglected. I'm not sure when I'll be able to use my laptop again...
That said, I'll try and address the posts here while I still have time on this public library computer:
I thought I would have an OpenOffice version of this available by now, but I haven't gotten around to it. I'll make that a priority.
As for Payback and Assurance, I thought I had already accounted for Payback, but I haven't looked at the file in so long that I don't remember. I'll make sure to put them in.
I was aware of the item boost before sandstorm a while ago, but I got lazy in fixing it. Nice find on Me First, though. Fortunately, with the way I've set up the Damage Formula in the worksheet, both fixes are really simple.
I don't know how long it will be before I can work on this again. It shouldn't be too much longer before I can get my internet access back (roughly a week--at least it better be), but I'm starting my Master's degree program in a week from Monday, and I can't reasonably expect to have any free time between now and December--nor between January and May, for that matter.
After all that, though, I should have my Master's degree and be a little more flexible with my time. Until then, don't expect any updates...