Normally you do have to do 50+% damage. The rules for EQ though are that normal DS damage is attributed to nobody. Thus if the lowbie does 1 damage and the DS does all the rest they are actually doing 100% of the atributable damage.
Revers DS on the other hand attribute all the damage to the one being hit on. I persoanlly prefer this method, pulling smaller groups. 3 at most and that way the lower toon is getting all devensive and offensive skills. Yeah theres a higher chance the lowbie will die, but your PLing them, and reverse DS are primarily a clric thing so chances are you can rez him.
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Plough E'mundar
Tradeskilling fiend of :
Baking (304)+15% - Brewing (309)+15%
Fletching (305)+15% - Fishing (205)+7%
Pottery (314)+15% - Jewellery (305)+15%
Smithing (313)+15% - Tailoring (312)+15%
Tinkering (300)+15% - Research (313)+15%
(Alt) Alchemy (300)+15% - (Alt) Make Poison (300)+15%