Yeah I'm not sure why the servo saver does that, something to do with the spring in it I think, but it was weird I had that exact same issue, turning the wheel left it would nail the wheel all the way over nice a quick, you'd notice the wheel almost bind a little as it fully extended, to the right it wouldn't quite make it all the way or really get fully extended, I played with the servo saver and problem solved.

[8D]