I can do 20k on my pet sorc easy by using just 3 skills and light attack weaving.
On my front bar I have lightning splash, blockade, volatile familiar, Flappy thing, inner light.
On my back bar I have power surge, crushing shock or daedric prey and hardened ward, Flappy thing, inner light.
Light attack, lightning splash, light attack, blockade, light attack, volatile familiar, heavy attack. Rinse and repeat.
Caveat: I live in New Zealand and deal with a latency of 250 on a good day.
If you haven't already guessed I don't personally like or use the flappy thing but it can be useful for better dps.