Having a few SR scrappers(a MA/SR at 50),i should know a thing or two about it.
I believe Elude lasts for 3 minutes,and when its down your left with 10 Endurance or something around that.
You might believe that I'm crazy but i do know that i use Conserve Power and a CaB to make up for the Downtime,and my toggles dont drop while doing that.
Which is why i think your left with some endurance when your about 100% when it drops