Thank you for the tips.

I never understand how this thing works, but with your explanation, I think it's better now.

What I was told was that if I vote for an author in less than 30 minutes, I will get good curation reward, but now I can see how it operates.
I'm still very new on steemit, 50sp was delegated to me around March, I could remember collecting 0.011 sp on one of my upvote which remains my highest until now, but I don't understand how it works because with the same sp, I have been receiving 0.001 or 0.002 sp even when I vote under 30 minutes... Hahhaahha

But, I can understand better now, I will definitely implement this methode.