The HN algorithm has temporal-gravity to help pull down old content that wasn't hugely popular. Due to that algorithm if the content doesn't take off in the first hour, it likely won't take off.
Those 2 points point to a far simpler solution. Just show most of the items from the last hour on the new page. So instead of 30 items, you show 100 items on the new page, which should accommodate most of the recent posts without requiring any clicks.
(minimaxir's point is also very valid.)