Would not mind hearing you go into further detail about your method . Thank you
I do something similiar,
I will start with my bard at low levels do not even really need any other DS just the bards. Remove his weapons, put something in his primary slot so he does not do riposte.
If the toon has a PBAE your basically set, or just run up a wizard along side whatever toon your doing. They do have weapons that proc PBAE I cant remember what level requirements are on the proc.
Have the bard pull as many as you can, really only limited by pathing. Have the bard play his Slow or snare songs so you can pick up some aggro. once you have that aggro locked, move the wizard in and start casting the PBAE just need to tag the mob with 1hp of damage as the DS does not count. After you have tagged enough mobs just have the bard start sitting so he gets hit.
It is more difficult at lower levels cause if the PBAE caster picks up aggro he is instant dead. You are only limited to what you can land the proc/spell on. You do not want to chain cast as eventually your gunna grab aggro, positioning is also important. I find more success not running to the middle of pack and trying to go around and tagging from the edges.
My path is usually CR then move to blightfire. Grab a couple of pulls to level up a few times and then hit the skeles in zone. Sometimes I do the bees and stonehive just whatever has dense mobs.
around 40 I hit up drak scar and bloodfields then wall of Slaughter. at this point you can basically level with max level. Its been a few expansions since I have done this, so there may be a spot to do After WoS slows down. But generally your getting xp at a very fast pace as your basically soloing the entire zone on a quick rinse. I can generally get a toon up to grouping level in one day on a weekend.
As you move along you start to stack DS like the mage so you kill faster, throw in a merc cleric and eventually his heals on you cause him to hold aggro and your songs give him the DS. Towards the end I switch over to an SK for more mitigation and DS and his ability to hold aggro with AOE taunts.
I have never found a faster way to pl a toon up to the group, it can be frustrating until you figure it out cause you may die a couple of times but its totally doable.