I did NE300 with 137kBP no difficulty lowered. With earth main.

And i don't have tons of OP ninjas.

It's all about strategy and luck. And retry.

299 way harder and took me so much time.

for NE300?

normal gaara SB- x - Jonin M

x -x earth with super armor

x x konan SB

What you need ? bring gaara's barrier and Jonin's bond for the second fight

And luck. Luck luck luck and more luck. If edo tobirama kill someone or proc chases : retry.

If you survive, launch first earth main mystery to proc dodge with pakkun, then use minato and Gaara on edo Hiruzen and Konan on edo minato.

Then, pray for edo hiruzen do not kill everyone next round if "control failed"