Blood talons is just REALLY REALLY strong. Having something like Moment of clarity will eventually cause you to waste energy and lose out on pressure. We also have several points in our weapon that straight up increase our damage from Rip and Rake so it gives even more value to Blood talons.
A tip for utilizing Bloodtalons would be to kitty moonfire targets for filler Combo Points if you were forced to heal so you can get the rake and rip in for the talent.
Just keep practicing trying to utilize it. Once done right you can create an insane amount of pressure.