How is a healer only doing 25 less DPS than a dedicated DPS class? That doesn't add up.
This is more realistic
WAR - 170 DPS
Healer - 100% Healing
Healer - 150 DPS
Healer - 150 DPS
DPS X 4 - 800 DPS
Total - 1270 DPS
*** War will only receive 115% Healing with Infuriate
PLD - 110 DPS
Healer - 30 DPS 80% Healing
Healer - 150 DPS
DD X 5 1000 DPS
Total - 1290 DPS
*** PLD will receive 120% Healing in Shield Oath.