OK, Gallery combat rate @ 80%
If the total percentage influences scaling, modified combat rate is 80-27=53%
If the number of effects influences scaling, modified combat rate is 80-35=45%
Since the cubist bull had a 56.4% rate, it seems total percentage determines the scaling, not the number of effects.
The wiki is currently conflicting. Not including sea only modifiers, it states that both more than 5 effects and more than 25% has diminishing returns afterwards. That was true when the only modifiers then were only 5% max each. Now that we have modifiers that are greater than 5%, it'll need to be re-spaded. I've marked the page as {{NeedsSpading}}
Edit: Semi-ninja'd ^^