There are very few things that you can't defeat by grinding your power way up. :)

With your current setup, try this:

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I used Pakkun's Summon Mystery and the Ghost Kill Tactics for this.

The goal is to stymie the Pains from tagteaming you to oblivion. Most likely you should be able to clear the first two battles with little problem with Chidori Blade - Shadow and some acupuncturing -- avoid using Sasuke's Mystery. Third round, target Pain Gakido to shut down his debuff wiping (with Chidori Blade- Shadow, natch, to combo into Hinata sealing his chakra), then hit Pain - Jigokudo, to keep him from resurrecting anyone. I'm not entirely worried about Pain Tendo's Planetary Devastation, as, played correctly, Tsunade will Interrupt that for you, buying you the time you need to cap him in the end.

Of course, if that fails, go Azure Fang and Poison everything. XD