[Most effective ways to manage Endurance in your widow?]

What do you use to manage endurance on your Widow?  My Night widow is absolutely sucking wind after going hard for 30 seconds.  I don't have the build but trying to come up with one.  Does anyone have a good comprehensive plan for keeping that blue bar from getting to empty?  I'm trying to build a Melee focused, Mostly single target, Widow, and there are a lot of options to help with the blue bar just not sure which is the most efficient.  

[To Infinity (Server) and Beyond (again)!]

@wasted here.  Mains were StarSeven and Magmatic Titan.  Also Gaia themed tri-box setup with a scrapper and two supports.