Creating a Healing buff and debuff

Hi everyone!

I want to create a buff and debuff that either increase or decrease healing received. I've tried some things but nothing has worked so far. I'm hoping you guys have some ideas. I tried so things like this -> https://www.dropbox.com/s/oe8pxj9hqwr0nrx/procedure.png?dl=0 and tried linking it to a healevent with a custom element (https://www.dropbox.com/s/9psm785erv792ig/code.txt?dl=0).