I thought the decision to make 4 and 8 man parties a bad one for this very reason. It is well known that tanks and healers are low on the population list on all MMO's. So why would this game choose to party less DPS with the tank and healer glasses.

I think things should be re tuned for 5 man parties. That would be 3 dps for ever 1 tank and healer. Realistically with a figure of 22% of the party tank + healer should make up 1/4th the party. Larger than 5 man light parties is too much so I think 5 man parties would be the perfect number.