Interesting. I've had the exact opposite experience with my Inv/SS tanker.
She was 44 when ED came and she had all kinds of end problems; I relied heavily on Conserve Power. But then when ED hit and I put end redux SOs everywhere, I found I had so much end that I respecced (1) into adding Tough, which I hadn't had before, and (2) dropped Conserve Power, since I no longer needed it.
I have one end modifier (or whatever they're called now) in all my attacks and all my toggles, and the three in stamina. I will run out of stamina eventually constantly hitting attacks, but it takes quite awhile and in any fight that lasts that long, I usually have a teammate who can give me end in some way.
(Note that I'm not claiming that my tanker is stronger or more enjoyable than before, just that she has a lot more end in my experience and can easily run her Inv toggles.)
