well...
1st i want to note that my wtm is my main class. That said i was helping some friends lvling up (meaning fate grind) and end up lvling 5-6 lvl pretty fast (had to stop bc they wanted to lvl my main like that <<)
my advice:
- Always goes with a party
- aero is actually very good, is an instant. just get to the mob and cast it, you should be able to cast it and put at least one. then just circle and cont putting aero around into different targets.
- something that helps is learn where the mobs spam, so u get to them 1st
- depending on ur friends gear u might be able to do more dmg with cleric stance, if they/u need a lot of heal i ll advice against this

note that i play at "off times" for NA, so fate are grounded but no insanely grounded (smn of my friends have told me that it can get CRAZY..)

hope that this helps, im no expert