ducking problems

I have project with lots of different mixes being applied on and off. Some via passive sound mix modifiers, others with mixes being called by blueprints.
The problem is that if I have X, Y and Z mixes being applied at the same time, that all turn down the volume a bit, of a certain sound class, I can end up not hearing that soundclass at all.
Like this: Mix X (Duck sound class A by 0.5)+Mix Y (Duck sound class A by 0.9)+Mix Z (Duck sound class A by 0.3).
Is there any solution to this?
Can I somehow limit the lower threshold of the ducking amount?

Anyone? Would love some suggestions:)