Sorry to pour cold water on your thesis, but my take is that something nasty is about to happen. Market neutral quant funds are taking an absolute drubbing over the last 2 weeks - that is the market is not behaving as expected based on the models these funds have been using to trade. That will mean a drying up of liquidity as these market quant funds unwind their positions. The last 4 times that it happened was Apr 2010, Oct 2009, Sept 2008 and Oct 2007. 3 out of last 4 times we saw significant declines taking place. While the odds are not statistically significant, I would be careful about going full in long.
Full disclosure: other than VXX position I am holding since Oct when I got bearish, I have no more short positions and I don't really care how the market moves anymore.
very good statistics for cases of SPY closing red while IWM closing in green on weekly chart. Just a reminder, only 5 of 11 cases take place in bull market, one of which was in 2007 top. Also two of them were quickly followed by sever sell-off. Actually, IMHO there are only 2 cases indeed favoring bulls(Oct, 2004 and Aug, 2010). Of course, whether or not it makes sense also depends on your time frame.