Haven't been able to jump into it yet, but from what I'm reading on reddit and here, it seems like the best strategy for Eureka is to form a party and then find a good grinding spot of mobs weak to the party's elemental choice and camp them? Posts on reddit are showing that it is better to chain pull mobs 3-5 levels higher (which would be like FFXI 'Incredibly Tough' ones) instead of mass pulling tons of lower level or same level ones (Easy Prey and Decent Challenge/Even Match).

If we use those terms (for old FFXI players), for those who have tried this 'camp and chain pull IT mobs' method, does it seem to work? What is the best pull method/level range/strategy people have found so far?