First follow kyc992's advice and get your assault skills in your weapon grid up. That'll help a lot. If you're doing 50% more damage, you might not feel the need to rely on healing as much as you currently are. Gaia's got a self heal, Azazel has energy drain and cybele also has a self heal, not to mention Joan's regen. Set is overkill and takes the place of a strong striker. Gaia's damage cut and block are stronger party 'heals' than Set's though they do this through damage avoidance/mitigation (a priori not after damage done). The only one without any self heal is Hastur. For now you can live with potentially her going down.
Dejnov.