To me, confidence comes from results. As an example I've had a lot of confidence last year and the year before especially. I caught good and pretty much couldn't imagine to do better than I did. This year however has been blank galore and something completely different. When that happens, and it has before as well. You (or maybe I) need to change stuff. Doing the same thing all over again expecting different results is being an idiot, a smart dude once supposedly said. This year it was a friend of mine who actually got me to realize I was trapped into my once successful habit. After blanking 9 sessions in a row, stretching over 2 months, I changed rig, hooks, hookbait and the next session I landed 3 fish in 12 hours out of nowhere. If I had caught 1 I would have left it to circumstances but the change was so apparent it was ridiculous.
What I´m saying is that changing stuff when things aren't working, is better than not doing so. How deep you want to take that is obviously personal but I personally don't like to keep things as it is, when I truly believe its not optimized even if it still "will work".
I kind of feel now that this discussion went a bit out of control xD