Overall it seems about right, as long as your doing the main story, dungeons as a daily, maybe the challenge log on fates and dungeons you should be fine. If your doing just main story , few xp instances (even with bonus) you will hit walls. Are you doing challenge logs? Company logs? Hunting logs? Beast man quest? If so you should be fine. Note the Challenge log grows and gives more xp as you level up by the way. Do regional / Company leves while traveling or waiting in queue. An alternative is just todo max out your level in dungeon runs, usually 2-4 will clear before level sync cap if from the start,