Thunder-shock weapon DCs & effectiveness?

[SerPounce]

I'm wondering what DCs people have for thunder-shock weapons and how effective you've found it. I've been doing EPLs with about 75-90 DC depending on level (more on the lower end except on 30 where I have I different gear-set) and it doesn't seem to work on ANYTHING. Even on epic hard stuff seems to save 90%+ of the time.

I'm sure I could get that DC up higher, but the fact that it just doesn't seem to work at all makes me skeptical that I'm ever going to it high enough for LE/LR type content where I'd actually use it.

It uses a strength save, which you would think would be lower than normal saving throws, but a 75+ DC works pretty decently on most epic mobs (not legendary, but I'm just talking regular epic mobs).

Kind of wondering if something isn't working right?

[edit] whoops, meant to put this in the Artificer subforum. Mods feel free to move.