I haven't put enough arrows through a Switchback to know if there is a particular issue with that bow/cam, however left tears are EXTREMELY common with Mathews bows due to the grip shape/style.

For those not used to the Mathews grips (regardless whether its the classic/comp/inline, etc) , or the proper way to grip a bow, a left tear that cannot be corrected with normal arrow/rest tuning procedures(for a RH shooter) is unfortunately often the result.