And? People go to the best slots, so they become scarce. That's natural. Bad times have plenty of slots, and force you to plan your next flights otherwise. I'm annoyed in current GW3 with my base in Palermo, as there is no free slot between 10:00 & 11:00, and between 13:00 & 17:00. At all. So I have to turn around, choose destinations accordingly, and make short flights in the morning. Even if destinations are not optimal.
That's life. That's a competitive game. There is a race for the best slots. Once finished, your next planes won't be as optimized as you'd wish. But if you are clever, you can still make money. If Haneda does not have any more place for your needs, you shall look somewhere else. Every other player has the same problem. I'm pretty sure plenty of competitors would like to use slots in Palermo in the early afternoon as well, as many lines are still underserved, but they cannot. They'll do another way. As me. Everyone has to adapt.
And it's realistic : Do we have 1000 planes taking off at 6 from CDG, then 5 hours of nothing? Nope.