During my pilot training I was in the maintenance shed for hours every week, trying to get a more comprehensive knowledge about the machines I was flying and trying to master. So I would seriously recommend it to you as well.
Besides, it never hurts to hear the point of view from the guys and gals that keep us flying.
As for giving the CFI a fair chance to own up: I agree it is well past that point.
If, as someone has mentioned, the blade spindles have taken a beating (I don't know the R22 but know this problem from other helicopters), it has become a flying deathtrap. No room for egos, do the right thing. NOW.
Furthermore, talk to your regular instructor about this. Get a feel for the safety culture there. Because, if many exceedences go unreported in that flying school, someone will come to grief. Make sure it won't be you.