Anyone know where and what to edit in the mod so that the quality modifiers can be doubled?

The default multipliers get legendary beltboxes to 2.5x speed (+150%). I want to get them to 4x speed (+300%) so belt-stacking beltbox stacks uses nice, whole numbers of beltboxes for a given tier of belts. Yes, it's probably OP and kills balance, but if you're using mods, "balance" is optional and defined by the player. (Heck, even a nerf to 20%-40%-60%-100% vs 30%-60%-90%-150% could work; I just want whole number ratios.)

A mod setting for this would be nice in the long run.