Right on...thought you might say it was a hodge podge of tools/skills/etc.. I'm assuming the exit decisions are made using a similar process. Did I understand correctly that you're not doing any delta hedging on these?
Exits are conditional to vol (1st order). I will tend to close large vol-gains, but directional exits are taken on system signals on indices (2nd order). I won't rule it out, but I rarely hedge these.
You find that there is a lot of vega pnl to be made in 1 month butterflies? I always find that my pnl is made through theta and not having too much drift in the underlying. Or is your vol metric something different than vega pnl? I like the AAPL term structure more. It shouldn't be that steep in this environment.