I've always wanted to learn how to use that calculator actually, but there are a lot of inputs and I usually have simpler decisions like Abou vs Barong or raw stats vs few extra points of assault, where I don't need to bother with the details, so never end up learning it.
Yeah, that's an extreme version of what I call red ability build (vets let me know if there is a more accepted term for that.) I might try that for the next tower. Being able to squeeze one or two more floors out of Solomon is very useful when you don't have enough himes. I don't have any wind vigoras weapons though, and not sure where to get one.