There appears to be some horrible dragging and scraping going on where the chamfer meets the floor of the pocket. From your tool description, your chamfer tool has a zero tip diameter. Unfortunately, when a chamfer tool has a zero diameter tip, then it also has no cutting edges and no chip gullets at the tip, hence the mashing of the workpiece.
You need to use a chamfer tool with a reasonable tip diameter so that proper cutting action has a chance to occur.
First you get good, then you get fast. Then grouchiness sets in.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)