You're missing a reset. No reset, it'll never start over at the beginning, so once it's out of sequence, it's out forever.

For locks, here's my fear line:

/castsequence reset=10 fear,,,
etc...

And for deathcoil:

/castsequence reset=120 death coil,,,
etc...

I'll leave the targeting/focus/assist out as we each do that a little differently. Hope that helps.