The Magician's Tower

No, I still get 14 at level 90... c urrently at 1000 aas.

14 for rivervale ruins
10 for wastelands of everfrost, and 10 for faydark

Ive gotten less a few times, i think from doing the same quest back to back.

Everyone gets a bonus if they have under 2500 AA's The bonus starts out huge at 0 AA's and then diminishes once you reach 2500 AA's. If you have over 2500 AA's most of those type of quests will give 3-4. Doing them back to back shouldn't change the amount of exp given for the same quest. If you mean doing each island back to back then yes the quests vary on the amount of exp given. For someone with over 2500 AA's it might only be 75% of an AA difference for someone with 1k AA it would be more like 4 AA's.