If you miss-time your tornado kick by 1 or 2 GCD, it's still a DPS loss...
Tornado Kick should be more powerful IMO, it doesn't even compare to Death Flare, it should have 400 or 500 potency, or give a 10% damage buff for 15-20s to make it usefull if you happen to use it at a wrong timing. (like a phase skip...)