[PsychoTechFreak]

I guess you are aware of this, but just to avoid a possible misunderstanding in my sometimes poor wording... The setting event frequency medium (10%) and the "Change Bad Event Chance - System" at -15 does not exclude events absolutely AFAIK. My guess about these modifiers is: Either -15 means -1.5% or the 10% of the event frequency will be reduced by 15%.