I recently shot with a fella that has a new Switchback and I NEVER..........EVER...........EVER heard (actually not heard) a bow that quiet. I even made the comment to him that it almost seems unfair to the deer
Seriously........this thing was silent......just the slightest whooosh of the arrow slicing through the air.
I really doubt that whiskers will be more quiet then the string bumpers they have but maybe both together would do something more for ya.
Make sure you check EVERY nut on that bad boy for tightness first though.