To those more skilled than I:

Does anyone have tips on how to do Threat from Above for the following team reliably and safely? I can get the frostwyrm downed easily with any of the following teams, but the 3 cultist bombadiers pose a challenge for some of my teams. any general tips on how to take care of this daily? I just hit champion status so not really experienced with this yet.

dk team, shockadin team, shammy team = no problem generally

4 mage 1 priest = spamming 4 arcane explosion with holy nova. but it doesnt pack enough punch to down the bombadiers before they blast the hell out of me. I usually win, but not without losing 1 - 4 of my team. any advice? mages are arcane atm with disc priest. i can dual spec em into something else though if that will help?

boomkin team = so far i have been popping treants, but they dont kill the cultists fast enough before i get hit with a bomb or two. similar story as above team.

Also a note on the champion's rewards. If I'm not in a rush to get exalted with all 5 capital cities, am I better off just picking the champion's purse until I finish the valiant dailies with all 5 cities? will doing the valiant quests for all 5 cities be enough to bring me to exalted with all 5 cities? just seeking to pick the brains of those more advanced in these quests than I am; and thanks in advance to all those who help!