Reduce stealth cast to 1 second
Reduce cool down to 10 seconds
Increase duration to 60 seconds
Currently infiltrating a back line is pretty much a death sentence anyway you are oor for heals and can't burn down the target in time. A 1 second cast might allot you time to disrupt the line and possibly escape. 60 seconds might allow you to get to oil or target in time to put some damage on it, you still have to navigate through the opposition and not be seen by their detection stat. These classes are supposed to be high risk reward but they should be escape artist as well. There are several posts out there recommending people not play the class. I think when you get comments like that it should move their need for change to the top of the list each class is instrumental in the game they all need to remain viable in all aspects of play.
Great job Dev's I appreciate your work and your consideration of player inputs.