It depends on how much these are reduced by. If it's made to be like ID it'd tick 2-4 times vs 5 and damage would likely go down quite a bit. If I were to change Sorcs:
1. Shades of Death, increase damage or allow crit, but with internal ICD (1s). Ticks should probably average around 500.
2. Absorb Vitality. Have a damaging first tick.
3. Black Horror, make this a chaining/leaping attack with a 2s cast. Hits your target and then jumps to the next one within 20 feet that isn't CC'ed after .5 seconds, for up to 9 jumps. Add 10s CD.
4. Obsessive Focus, heals you for a small amount each time you damage victim, 30s cooldown, drops when target dies.