Whip, obby shield, dragon halberd with basic melee gear(high range defence). A longbow/crossbow, couple bolts/arrows to distract healers. and dhally Jad all the way.
Sometimes when healers are near Jad and healing her/him, the mage attack animation takes sometime, but the hit will come fast. My advice, also i use it all the time for Jad, pray mage after each range attack.