I don't have a level 60 yet but I colevel 2 classes with roulettes, sidequests, dungeon runs and daily hunts. Alone doing roulettes and hunts is 50% of a level at currently 57 (57,5 and 57,8).
If you want/need to do FATEing its sadly still Northern Thanalan for best XP (Dark Devices). Good is if you have someone that levels along because DF can too easily piss you over if you only run alone
Sadly till some adjustments in XP gain its a pure grind.
GL and if you need a break from the grind TAKE IT