Any other ideas? What's your opinion on having quests that give such a large amount of xp?
The reward should equal the effort. Right now, that is not the case in the least.

Let's be honest; I like having to actually make some effort to get where I want to be. Having a capped class should be a distant ultimate goal with lot of new activities to aim for in the meantime and not a "sigh why do I have to level to get to the good stuff at the end..."-hindrance.

Therefore, I completely disagree with everything said here. Sorry bro.