Between FATE grinds and some leves along with the challenges, my leveling friend and I haven't had too many issues rolling through the 40s. Heard plenty of nightmare stories about the process, but those issues do appear to be alleviated somewhat with the additions others have mentioned.

Then again we've enjoyed the FATEs around Mor Dhona so we stop to do them just out of principle, so maybe we were grinding unconsciously while doing other quests and it just worked out that way.