My perhaps naive thought is to sell during the first 30 minutes because of the euphoria. That said, it can go the other way and could be a good buy opportunity but my experience is that it's too noisy.
On entering a new position, I feel the last hour is good to watch and see how the market has digested today's news. Yes, I may not get the best price, but I am not trading on a tidal wave of emotion like earlier in the day.
Can you please share your approach you think that is superior?