Part of why I consider the boomerang sword stronger than the bomb is that it has more utility (it can block bullets and isn't affected by gravity so it's possible to hit some things the bomb can't), and likewise Paige's "increased sword strength" is actually referring to her attack animations having a much larger hitbox than anyone else and not the damage output. But it shouldn't be too hard to just fudge the numbers a bit for both those cases since there's already support for dealing fractional damage.
(I fixed the text issues on the store page, including mentioning the "more spikes" modifier)