You should be able to achieve 1.1 - 1.4k DPS as a sorc in trials. You will be using crushing shock, Critical surge, pulsar, inner light and mage's fury on the bar.
Keep crit surge up at all times, weave crushing shock with light/heavy attacks and replace with mage's fury under 20%
This is literally the only build that will do anything close to decent DPS in trials.
it sucks, but it is what it is.
Negate FTW tho