1. Create your own party finder and excludes the same job as you (if possible)
2. set up rules for party finder and hope people will follow it, (exp: must be willing to not need or greed for "job" loot)
3. run with your FC
4. use party finder, if there is a same job player presents in the party, asking them what they are looting for.

I hate fighting over loots, so if i found out someone was looting the same thing as me, i would either leave the party or create my own.