Here is what I generally do from 15-50
Crabs near bloodshore 15-22 (full to light party depending on levels)
Crabs near bloodshore east of the 22 Crabs 22-26
Crabs behind the Tower north or Cedarwood 25-28
Diremites in Thanalan near the aether point south of copperbell mines(forget the name sorry ^^

28-34
Antlings in Copperbell Mines 32-38
Efts in Tam Tara (very steady exp for a full group and you just camp, but a bitch to get too) 36-42
Ixali east(?) of Treespeak upper area 36-43
Ixali Camp north east of Treespeak (lower level near the 36-43 camp) 42-47
SH camps 42-50 (depending if you make the group, if not expect 45-50)
Thats normally my exact leveling.. I HATE raptors as they are terrible xp per/death