I'm not a big index trader, but I have been trading the XAU lately. At first I was just taking a position, but the morning runs up and down have turned my positions into overnight trades 3 times in the last week. Lots of action in the first hour and the last hour. Fairly good inverse relationship to the nasdaq. Maybe you could look at the XAU and give an opinion on whether your system would work for it ( although I'm just not the double down type )