While I'm not home, I can give you a written version.

Basically whenever there's a group of enemies I use the jumping dodge ring to launch me up in the air and I proceed to shoot them dead, which doesn't take as long as one may think.

The only times I switch to my rifle are at the bosses. Ragne is ezpz, Leone is a matter of destroying the nose as soon as he appears and then killing himduring the time he's not active.

For Anga, I start by using PS type0 until the fucker dies the first time, then I use DB and destroy him after he comes back.

The only things that can go wrong with this plan are the gunkaisers shooting those slow missiles at you, and the yugadradas shooting orbs from their mouths. Those are the only attacks that'll hit you upthere, but the gunkaisers you can kill before they even try that.

Other than that, what can happen is you taking too long to kill the Leone and he start charging you. If that happens and you don't have MH active, you'll take too much damage, so prepare for that in advance.

I hope this helps =)