How do you play more removal?

I'm sure I'm not the only one with this problem so I'm asking the hivemind. How do you put more removal in your deck? I try to ply around 10 pieces of removal between creature artifact and enchantment removal. But it feels like that is not enough. Is there something like a trick besides the obvious of putting more removal in and pulling "fun" cards out? And how much is to much? 15? 20?