To ensure full use of Death Strike you should be Hit and Expertise Capped.
Currently for Dodge/Parry you will want to try to get them as "even" as possible. Also anything in excess of 14% could be considered fair game to reforge to Mastery. Since at 14% is where DR is very noticeable.
You want as much Mastery as possible because of Death Strike. It makes your bubble more powerful.