how does this stacking percentage work in the settings?
I tried different percentages but cant understand the mechanic. I like to make sure life/mana are separate and a new fish goes to a 20% neighborhood stack. but its not functioning, or I get it wrong?

e.g. my stack averages 50 life, a new fish between 40-60 life should go into this stack, do I put in 20%? Some fish dont go to the stack, although the percentage should allow...

help is appreciated, i cant find a guide on this.

make sure you only have one stack of the fish you want to stack. If you have multiple I life stacks, it wont stack , for instance.

The fish stacking percentage is a little confusing. It is applied across the range of catchable fish per tier. Using sardines as an example, you can catch fish from 25-100 life, for a range of 75 life. If you set your fish stacking to 20%, you will have the following:
0.2*75=15
25+15=40
The minimum fish life you will stack then will be 40 life, so you will stack all sardines from 40-100 life with an average of 70 life per use

Thank you, both helps.