Totally situational and based on how comfortable/capable you are as the party healer. I think it's awesome that you managed to keep everyone up while DPSing! Whenever I jump in to heal, I only DPS when I feel like I have the time to stance dance while the party is in good shape and there's some breathing room to apply the extra DPS. If things look like they're getting too intense, I stick to strictly healing. Whatever works best for you