Paladin + 2x Warrior + combat rogue + mage

mage = AeOing

rogue = is combat so he can hit 2 shammans at the same time and with adrenaline rush

2xWarriors= sweeping strikes + cleave

i can instant kill the mage but the 3 melees hitting all my shammans at the same time is impossible to heal for my paladin (i have almost 400 resi and 10,6Khp)

i tried spamm heals until they run out of cooldowns that hits 2 players but then if im lucky of dont die then i dont have enough mana to kill them.

any idea?