hey welcome.

im guessing you're not going to be "boosting" your RAF.
and its not a big jump from 2 to 3. now, if you're doing 5 with the 1 tank, 3 dps and 1 healer, that will be a big jump.
but with 3, i suggest a tank-like main and two dps who can heal as well. having the two slaves as the same class can really help simplify things.