Yeah, I actually feel like I'm leveling faster the higher level i get. I'm on Balmorra, hardly into the story quest at all yet (I love doing the side quests, and usually put those ahead of the class quests..) and have run BT a few times, HS once, and done a few of the space missions and it seems like I'm leveling faster now than from 1 - 10.
It's like the higher level/better geared I get, the easier the quests are to complete, and therefore the faster they get completed... making the process go really quickly. I remember it seemed like it took forever to get to 10, and now it's just flying by. I'm thinking lower the amt of xp granted for quest turn ins and mob kills (but don't give a toggle to turn off mob xp), and especially lower xp granted from space missions. I was pretty much right on track with pace until I started doing those (and they're fun, so I don't want to NOT do them).
my 3.1415926535897932384626433832795028841971693993751058209 cents. Roughly rounded, of course.