Could you please clarify what buffs/gear you have, and how many mobs you try to get in a single pull?
Long time ago (In the SOL era) I found a guide where a Druid was using solo PBAE in the Grey. He had no merc at that time, but pulled about 40 skeletons and killed them in one pull. The Idea was to pull 40 skeleton at fullspeed, outrunning them, and then time the PBAE so the mobs get hit but did not reached to hit him. He also found that a maximum of 4 mobs could hit him in the same round.
He pulled about a ton of mobs in Grey, then rounded them up (like a quad kiter) and then used succor. All mobs but the skeleton wandered back to their spawnpoints, and he got a nice bounch of mobs walking at the same speed. He had a hard time to get enough mana, he had to med-kite (run a distance and meditate for a few seconds). I think he had KEI and +8 or +9 in manaregen (manaregen wasn't that common at that time)