Using modular parts especially applying various calculations the rounding of buffs to percentage integers is not fine grained enough. So I would like to suggest allowing up to three digit precision for buffs. For example 0.001% precision.
Finer Buffing
mmm floating point errors
I assume you're just talking about the text that's printed. (The actual buff value is calculated to full 32-bit float precision.) You just need to change the BuildBox/BuffPercentageFmt key to BuffPercentageFmt = "<good>+{0:0.###}%</good>".
No, that's not it. The rounding problem I see was within the part debugger, though.