Whenever I run into these situations, I just get my nose lower, and jump it a little higher. This is a fairly common technique in supercross and arenacross racing. Your front wheel will already have rolled out onto the flat, when your back end is just touching down (because the landing is shorter than a bike length). You have to have your timing absolutely perfect, though. Match the angle of the bike with the angle of the landing, and just land the front end right at the top of the landing ramp, and just keep your bike at that angle until your back wheel has touched the ground.