I wish I could be more help, but the teams I leveled through Outland are either able to kill with a couple of instant casts (affliction locks + priest) or can kill pretty quickly anyway (balance druids) or could level in instances (my mixed group). I did a little bit of grinding on a couple of the teams and I've waited to do quests in Terrokar and on until my mixed group hit 70 (instance leveling). Overall, if you're doing some collection quests that are just too rough with the drop rates, find a location where you can drop the mobs pretty quickly since that will likely help you out more than the quest (again, depending on the quest).