Had to log in just to say thank you!
Eventhough I didn't follow this step-by-step, I did manage to get through it using a slightly different variation.
Lv80, 46k power, I used normal Gaara cuz I don't have KK Gaara, my setup were:

Iruka, Gaara, x
MC, Sage Naruto, x
x, x, x
With 44431 as talents and Flood Dragon as summon.

As Tendo always kills like 3 of my ninjas in 3rd round, I ended up focusing on killing Tendo first instead of Jigokudo. So first round I wind dust Tendo, and Iruka on Gakido to prevent shield. Second round I did the same as you but also use Gaara because mine were normal Gaara and needed to setup first. Third round was Gaara nuke round which took out 2 of the remaining 5 Pains and left 2 of the remaining 3 on the verge of death, which standard attacks from my team managed to clear out. No deaths except for clones.