i dunno i always subed drk because i liked the melee bonus and souleater + vorpal blade is always fun dmg
they say rdm loses melee cabibility in exp parties past 30 or so.. i proven that wrong many times XD
1 lvl away from being a chainspell stunner so i dont see any point in subing anything else
as for how i did it... its really easy to kite these suckers in the pond since they lose aggro in the pond lol i only had to sleep them 3 or 4 times i think