Man if you still don't have it, I recommend getting a license for ''Waves Sibilance''.
One of the things that I most hated was going after those ''s'' sounds to correct them, it was a pain in the S indeed lol
After I got Waves Sibilance my nightmares with it ended. It handles practically 99% of the problem every time automatically without affecting
the voice itself and just attacking the evil S's. You just need to figure out the best settings for your voice, then save a preset and use it every time.
Listening again here, the S problem happens in many parts of the lyrics.
As for the crash... I am not sure if it is really the frequency or just a bit too loud.
I am sure you will find out though. Everything else sounds great! : )