Mega Man Zero 2 help

[Himuro]

Urm.....fellow Mega Man Zero 2 players, you gotta help a guy out. This stage is driving me crazy. I've mastered it and pretty much the whole game, and can get A's, S's, and SS's out of my ass at this point but why do I keep getting a C on this level? It's driving me mad. Am I missing something? I know I messed up a bit in this vid, but on average I usually do better than this, but I STILL get a damn C. This isn't C worthy playing! I'm not even using Elves!

http://www.youtube.com/watch?v=BL6svHTjIHQ

ARGH. Why'd it end halfway through the boss fight? I wanted to show that bastard cut in half!
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She knows stuff.

[Himuro]

Ah yes, it appears that if you get a C you can't get up to A or S or anything. No wonder it wouldn't go up. I restarted my game and I'll just do it this way. Lesson: never let your roommate play your games, and if he does, don't let him save over your save file. Dirty, lousy C.

This time I was going for a no hit run on the intro stage. Got hit once. Not so bad, it was a good run.

http://www.youtube.com/watch?v=Ur29DVVHca4
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She knows stuff.