I have only seen 5 spam posts in 3 days.

If you are still seeing spam:
1. You are not paying attention to your relay list. You should remove/disable relays that are sending them. Amethyst shows relays the post came from below the author picture in Complete UI mode on settings. Move to safer relays.
2. Use hidden words in the Security Filters to hide common names/phrases out. 
3. Always report impersonators and csam content. This will alert your followers of potential bot traps and let your relay operators know you didn't liked their posts.