Why is there not enough quests to level you up after level 30+ ?

[Yagrush]

Make sure to keep up with the hunting log, it keeps appreciable amounts of exp.

I personally didn't feel an outright lack of quests until I hit around the lvl46 area, when the story quests start making huge jumps in level requirements.

[SNS]

I've actually been doing the hunter log too, but its making no difference. I'm now grinding like an idiot doing repeatable quests.