Husqvarna illustrates using ears in the felling notch but I like to use the hinge for total control and try to stay away from altering the notch in any way that might affect the hinge.
They suggest using shallow cuts.
The cut that I show is used by arborists to keep the wood from tearing into the rigging gear.
This kerf cut is put in after the notch and before the back cut.
A couple of inches below is the norm.
The hinge is sacred to me.

I should add that this is just to eliminate tearing along the sides and not intended to take the stress out of a leaning tree.
It might look like a complete bore in the picture but it isn't.