Fridge Leveling Issue (Kenmore Pro 79993)
My interpretation of the instructions you just posted is that it is obvious the manufacturer intends for the unit to be installed with a slight backward tilt (front feet higher).  In fact, they did you the courtesy of building it in.  

Believe me, you don't want a refrigerator with lazy doors that you can't quite ever trust to shut properly.  You want a door that closes smartly and with authority, without you having to worry about it, hand-guide it all the way shut, or double check it.  

For what it's worth, NEC 110.3B make manufacturer instructions like this actually mandatory.  You could argue it'd be illegal to defeat the intentional front lift.