Try using a Weak Aura to track things like this one.
Code:
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This will make a really horrid noise when target is below 45% HP and show Soul Reaper Icon, It will also tell you when Dark Transformation is ready. Oh and tracks your stacks of Shadow Infusion.
Helps if you suck at pooling RP to keep timmy up as much as possible and to track Soul Reaper if you suck at reapplying it. The beep will make you want to rip your ears off so be sure to apply it fast!