I'll play around with that--I didn't realize you meant expirations so close together. How far OTM are you looking? I'm having trouble visualizing the time-dimension curve in my mind--you'd think that would be easier than diagonals, but I just haven't spent enough time with calendars.2) I don't understand....
But,
1) "Oh! The Secret Sauce!"
For 2, I never go naked shorts. But I'd have no problem doing a long-short-long fly--basically two ATM credit spreads--as long as it's got good return potential.