By "didn't work", what do you mean?
Skill.Fixed is equivalent to Skill.Value multiplied by 10, so at GM Alchemy, that would be 1000 / 9 == 111, which will totally eclipse the bonus from EP.
You probably need to do something more like this
// 0.1 skill == 0.1% bonus, up to 1.0% (100%)
// using...