I believe this becomes common knowledge to ppl @ 75. Because there are no IT's (pre some recent patch where all golems are IT now).
That said, since I got it down to a pattern I haven't hit less than chain 22 in sky on deco weapons (front gate). Usually hit up to Chain 8 on golems (IT). Deco weapons yield ~10-11k/hr, only because of ppl going afk randomly after chains.
It's nice to get 1merit/hr. I've found best setup to be all nin or /nin. Seemingly only leaving nin/war, and war/nin as options, as they're the only 2 that benefit from dual wield (other than thf, but bad thing about thf is the positioning to do dmg, and w/ a mob flying around, there is no great positioning.) The greatest thing about nin or /nin is that there is literally 0 dmg dealt, and little need for a healer (other than random instances of AOE/minor abrasians).
Brd becomes the ultimate puller here. They have to know the environment like hte back of their hand, know where every mob is supposed to pop, and place it exactly the distance that you can run to it, and still kill within 45 seconds (timer past chain 5). RDM can do fine as well, however in sky, every mob aggros to magic, so a rdm can't sleep w/o aggroing more mobs, thus off positioning monsters.
The tactic isn't more so of a speed kill, as more so a "mobile party". In that there is no camp. You keep running to the next mob, instead of pulling it back to you.
My static is nin/war(me), war/nin, brd/whm, whm/blm, and we just look for 2 more nin/war or war/nin. Honestly though, I've found nin/war to do more dmg than war/nin because of how fast they attack.
-Sam