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.
Sorry. I have a hard time believing you completed HM EC in a full Columi geared group.