Breaking apart the compound movement can help you focus on an area of weakness. Floor presses with boards help you train all but the bottom of the bench press.
The floor press also limits the range of motion of your arms at the bottom of the lift. I’ve also a 2-layer (two 1×6 pine boards) board stack under my shirt. By making the lift more shallow, you can work on building strength on different parts of the bar path.
285 lbs. is ten more pounds than my current 1-rep max. I’m looking forward to the next test week so I can see how far my bench has come since my move back to powerlifting. It’s the only lift that matters, after all.