WPS mechanics clarifications needed

I have some questions about WPS mechanics, and quick looking over forum didnt bring me answers.
Lets assume I have DW blademaster with plenty WPS from masteries (Amarasta’s, Belgothian’s, Whirling Death, Execution, Markovian’s, Zolhan’s) and one extra from Blademaster relic.

  1. When any of WPS procs (especially speaking of AoEs like Whirling death), does it add to default attack (or Cadence), or totally replaces it?
    (I know that cadences 3rd hit cant proc em).

  2. How do WPS stack? Can 2 or more of them proc from single attack? And if not, what is the priority\order of WPS procs?

  3. Is there strategy to gain max effectivenes from WPS? Should I have 1-3 of them or grab every and get to some optimal level. OFC it depends on answer to the 2nd question.

Nevermind, found it here http://www.grimdawn.com/forums/showthread.php?p=251715#post251715