Well, I don't play ranked, so I can't be of much help on that question, but I think I can still give a decent answer. Most players who follow the meta play passively, farming the minions, and poking only when they have the chance. Very few ADCs work in a very aggressive lane. Additionally, that much harass might lead to the lane getting pushed, bringing in the jungler, causing deaths on your side. I love playing Lulu, and I do poke when I can, but my main focus in on keeping my carry safe. Also, is Lulu the ONLY champ you're playing? If that's the case, you might be forcing yourself into matchups that are horribly outbalanced from your favor.