Is Rakata enough for EC HM?
Yes, its more than enough. We have run Columi equiped full groups of alts fresh from hardmode flashpoint runs in and walked out fine.
The stat value between columi / rakata isnt a massive DPS or HPS or Aviodence / Hp / Mitigation and its not much higher going Rakata to BH/Campaign. I think when running mox dps parser i went from about 1300ish in non optimised gear without being fully augmented -> 1600ish in optimised gear with augments.