Wow! Thank you very much! The very first time I can farm strong approaching solo! Having now around 12.500 points of power.
Now I can do it with all ninjas alive and normally all with half live.

I made two variations I consider improvements:
- The position on my main is close to Guy, so clones can stay before Crimson.
- Instead Bottom Force, I use Pose of Duel, that lasts for ever instead only one round.

And some advices about how to get it, which can be surely improvened:

FIRST WAVE:
- Against white zetsus, at the beginning of the second round, use acupunture or main mistery on last zetsu.
- Before the last zetsu is over, do Kabuto's mistery, so...

SECOND WAVE:
- ... the clones will receive Haku's damage instead on or two of your normal ninjas (!)
- Interrupt Haku's mistery, with Guy's or Crimson's mistery, but anyway, be sure that if Kabuto is without live, participe in combo, so he can leech, for no killing itself whit their pasive (sic). And calmly leech some life.
- Again, do all clones you can!

THIRD WAVE:
- Easier if you reduce to x1, do Neji's mistery on Hidan to interrupt. Your clones (maybe 4) will tank almost all the first round damage.
- Cast Crimson's mistery on Kazuzu at the beginning of second round. If you can't interrupt the powerful Kazuzu's mistery, no problem, you will survive anyway (!).
- Let Hidan kill itself damaging one of your ninjas, and focus on Kazuzu.

DONE!

WOW!
Now i've tried NORMAL, and I got it at the first try with the same equipment!!!
Even if my main died on third wave!