Pre-echo buff, I DPS'ed as much as possible between heals on my SCH. For Turn 4 in particular, I really only worried about helping bring down the spiders with a bunch of AoE Dots.

Post-echo, I don't bother dps at all. In certain fights the echo makes the dps so high it messes up the flow of the fight. And if your dps can't bring enough damage with the echo buff that they need you to dps....find another group, they aren't getting anywhere.