I think Chester sounded great this year. For him. the KROQ performance he didn't sound that well at all though, which always happens to him mid-tour. I thought the early festivals and for the majority of Honda Civic he did well. He goes back and forth a lot nowadays though. His screams differentiate a lot, sometimes even midshow, I think it just depends on how much he's willing to put into them.
We need to keep in mind to not judge Chester's singing ability just on his performances with LP though, a lot of that material is hard for him to sing, which is why it's odd that they(Mike?) keep writing hard songs for him, lol. Go check out the recent Camp Freddy show, or his DBS shows. He sounds great on those.