Same same but different?

Are giant robots/algos controlling the markets? The last 2 big -8% dips lasted almost exactly the same time periods of about 2 months, so will this time be different? Applying the same time ruler on the last 2 dips to an expected upcoming dip, we get 06 May 2013 as the week the market bottoms around 1420, which equates to about -8%. The weekly RSI is also overbought, same time as when the last 2 corrections began, & theres that long term rising RSI support from Sept 2011 still in play to support the idea of a 1420 support.

SPX 110313