It sounds like there is something wrong with your grip if it's going through springs like that.

I've got multiple Benchmades axis knives, a few I've been using very hard for years, and never once have I had an omega spring problem.

In fact, my EDC is a 707 that I've had since that model came out (2005). I open and close it pretty much daily, multiple times, as a nervous habit and I still haven't killed a spring in it yet. I've even gone swimming in the ocean with it a few times without issue.