Also, since no one else seems to be saying it - not to be a jerk or anything but your experience of needing to spam RoHalone on a boss in an 8 man to keep enmity is NOT typical for the tanking community. First, that's a really really inefficient way to generate enmity, and second, you are i58, so if you are trying to do anything beyond Ifrit HM with that gear I could definitely imagine you are struggling to hold enmity against people who are i80-i90.

If you are going up against other people with comparable gear, then you should not be having any issues holding enmity.