1. dont rely on lowered difficulty. ig: if 1 person cleared it in 1 day since that NE was released, the difficulty will be lowered by one, and the next condition is 4ppl cleared in 3 days. but if that condition isnt met, the difficulty will never lowered anymore.

2. try other ninjas, either have high dmg, or field dmg, or interruption/chaos/immobile (chaos and immobile may likely be control failed) (in this case, knock tsunade first, she heals twice, annoying...)

3. worth a shot to try premium ninjas (if u got any), reccommend hokage minato (yeah i know he's expensive and not rly that good in pvp, but he's super strong in pve, well his standard in pvp is outstanding)

4. doing NE is about strategy. so find somewhen u have lots of free time (2 or 3 hrs) and with a good mood, try to *ize and counter the problems (usually by changing mains, passives and carriers (main dmg output ninja)).

PS: i used hokage minato for 259 too (hehe) at 120k bp, difficulty lowered 1/7 , so if you dont got him i wont be any help to you, but feel free to do experiments and share your lineup (dont have to be f2p, but not that op like 6path naruto xD)

wow with difficulty 5/7 and 145k it might be too easy xD...

with 259 i used this lineup (stack minato and iruka), minato have 10k ini or more (mine has 45k bp), summon mys pakkun or shiba.

I put minato at pos 3 so that the tag keeps after tsunade heal TWICE (insane).

Arrange the lineup so that all clones got shield by iruka. For best quality tag jiraiya (if he isnt dead at round 1) not tsunade (cos sakura will heal tsunade if u tag her - lowest hp in lineup). if dont got tag, retreat. (sakura has immunity)

r1 save iruka mys till kurama mys (if he combos, if not, use on whom u like to be dead next, ironically u want him to combo to get rid of the mys haha)

r2 minato mys on the tag, then wait after shisui, kakashi mys, impletus, then save iruka mys for kurama (if he combos again, if not use minato mys for extra round usage), you should kill jiraiya by standards.

r3 minato mys on the tag, if dont have tag, aim sasuke, the rest might be easy.

r4 minato mys if u have or gaara's (if they have anything left ) xD

For 260:

summon mys pakkun

arrange the lineup so that all clones got shield by iruka.1st round interrupt hidan and MUST IMMOBILE nagato... if failed then retreat... masked man MUST survive with more than 30% hp, everyone else should survive too. if u dont got tag, retreat.2nd round, aim whoever got tag. After kakuzu heals, impletus and immobile nagato again (if he's not immobile then need 1 wind clone in front of minato and use minato mys so nagato wont take charka).

3rd round, aim nagato, konan should be dead by minato standard, if zetsu or deidara mys, iruka mys on him.

The rest should be quite eazy.This strats need some luck (if u have high control stats, it will benefit more), some high damage on the carrier and a bit tanky clones.