+INT does not effect Tame. Nor does any other AF effect enhanced abilities with other random +stats on it. They are all meant to even out the jobs and provide stat boosts in which that job can't find much of in there equipment.
The only good I see the INT part doing is strengthening resistance to black magic as your INT vs. enemy INT is what decides that. Please... please... stop insinuating that just because a stat is added on AF that it effects another trait of that equipment. Because it doesn't, fact. This goes for all jobs.