I had these kind of issues in AK as my PLD because I only have my HQ ilvl55 weapon and everyone I DF with has relic. I had one party with 2 BLMs that would nuke the crap out of every group of trash mobs with Flares. I held aggro pretty damn well I'm proud to say, but I did have to change my style a little bit. After the pull, I would always start with a RoH just to give me an immediate lead. I do the whole switch targets between RoH combos but if I see people catching up in the enmity bars, I start spamming RoH only (not the combo) just to try to keep me ahead. For me it's just a change in play style sometimes. I am not condoning DPS to just jump the gun, just saying that there MAY be some ways to get around it by playing differently.