I get what you're saying, and my experience is totally the same. But.. when I really think about it, I find my prior feelings of conviction tend to grow in posterity when there's a positive result.. and vice versa for not-so-great results.
If you can just manage to cut out the:
a) fomo
b) 'its already ran so must drop'
c) 'its already dropped so must rise'
and see what's left.. it helps alot.