Halpp

[elite.runners]

don't miss any quest though, as far as i remember, i managed to level up to l41, just by doing normal quest and first daily quests from kraag campaign to shuyal campaign, but yes, maybe they mistakenly reduce some of the quest xp reward,

and anyway, mobs in kt4 actually stops scaling at l56, and each level after that, threat level and xp gain will start getting down/penalized, until it become 'gray level' (4+ level difference) and you won't get any xp,

as an alternative to tombs, try tindirin - jagged trail from 36-51 (until threat level changes), 52-56 in glinstone caverns-misty grotto (or gnomish ruins), and 56-61 in underhul-citadel,
and even better, no need to rush, just continue doing daily quest from kraken isle campaign until shuyal. you will cap in a very time-efficient gameplay :P