1. For example, boss has less than 20% hp, lets say you have 0 shards and less than 10 seconds left on corruption and unstable affliction but 20 seconds on agony. You drain soul and gain 2 shards back. Do you soulburn soulswap, or recast corruption and unstable affliction and save the shards for haunt?
2. Should you always let drain soul tick 2/4/6 times to get a shard?
3. Is it a dps loss to clip drain soul on the 1st, 3rd, and 5th tick since you dont get a shard?