I have both feet and a pair of hand-to-hand melded bringing fire potency to +40... 0 dmg difference :P

I think your better off doing one of the following right now on PGL

1) Use Ifrit's claws w/ a harness(crit atk power) and felt gloves(double attack or triple str) for some accuracy because you do start to miss quite a bit on higher level mobs.

2) Use Mog fists (I do this) try to get like +100 crit power body body, use mercenary trousers/ul'dah ones for +atk, sipahi gloves for more crit rate (bring you to +30)

I think either option will be viable for some great damage output, option 2 is harder to achieve but will give you very high accuracy and damage potential! Where as option 1 you will miss much more but damage will be more consistent. I would not bother with any elemental potency until they change things with it (I did it when they were cheap)