This is an interesting question. I looked into some related issues 2 years ago using the databases Prosper releases to the public, but not this one. What are the time stamps on your AQI investments? Loans are posted to the fractional pool at noon and 6pm eastern weekdays and 3pm on weekends. They don't all appear at once, but most days they're spread over only a few minutes.
One notable concern is that the most popular loans in the fractional pool are funded very quickly (seconds to minutes). If these loans are actually better than average and the AQI isn't competing, then investors using using AQI can expect below average returns.