Afternoon No Trade Zone

We have a rule of stopping trading before the afternoon chop. Here is a chart showing it pretty clear that we shouldn't be trading during the afternoon / current market environment. The breaks above and below the channel, with no conviction on the breaks for breaker positions, are due to institutional traders accumulating positions during this time. For example, buying 10,000 shares at 12:45, 10,000 shares at 1:00, etc etc. They accumulate their position over a period of time to say amount to 100,000 shares.