I'll have to give a couple of those things a try. I left a thin film of oil on my striker, smeared on with the tip of my finger, so I don't think there is enough to obstruct the striker channel, and my gun is pretty new, so I doubt the striker is broken, but I did use a q-tip to wipe out the striker channel last time.
Either way, an extra-power firing pin spring would be a good thing to have.