Traps and Blade Percentages

The percentages of shields and blades are weird because they can go over 100% and still do a good amount of damage.  Here's the catch.  When it gets over 100%, it doubles the amount of damage.  For example, I use blood bat with a Myth blade +35%, Balance blade, +30%, and a Myth trap +35% and it does 200 damage because it double it.  It would of done 100 plain but, the blades and traps increased it.