If you're keeping Apected Ben(Diurnal) up about 100% ( not prepull) and stacking aspected Helios before/during rough patches you should have plenty of time to DPS. Allot of being a healer is gauging how much damage a tank will take over the course of the next GCD.

If your healer gear is up to date and you are actively trying to DPS I think you're giving yourself too little credit. As your gear gets better the smoother it will feel on your healers.