Chart from Bosco
I think this sort of thing might work well on the VIX, trading the SPX in the opposite direction.
Here's why:
1) The VIX is mean-reverting. It doesn't stay at extremes away from moving averages for long.
2) The VIX is highly autocorrelated. If it is down for one bar, it's highly likely to continue in that direction. This means reversals are easy to pinpoint.
3) It tends to lead the market.
Try 585 macd on the VIX with buys on the SPX if the macd crosses above 0.10, and sells if the macd crosses below 0.10.
Exit positions as soon as the macd crosses again, regardless of where it is.