Thanks, Mark. That's very interesting. Two things of further curiosity for me.... The 'extra calls' - I know you buy upside curvature that way but doesn't buying extra calls overwhelm the smallish credits taken in? Are they really needed given your "close at short strike" risk management? And why not buy extra puts as well?
This fall/winter was probably an interesting test case for your strategy. Did you have any issues with that rally? With the rally, you must have been a) closing lots of spreads early and b) establishing new spreads at increasingly favorable volatility levels. How did that work out?
On the downside, I see more risk. You have wider spreads, thus more absolute risk and lower vega. Downside moves are faster. And if you continue to establish additional put spreads, you'd be doing it at unfavorable volatilities.
This fall/winter was probably an interesting test case for your strategy. Did you have any issues with that rally? With the rally, you must have been a) closing lots of spreads early and b) establishing new spreads at increasingly favorable volatility levels. How did that work out?
On the downside, I see more risk. You have wider spreads, thus more absolute risk and lower vega. Downside moves are faster. And if you continue to establish additional put spreads, you'd be doing it at unfavorable volatilities.

