Raid Finder and Duty Finder are 2 separate things. If you only see E1-8 and E1-4S, then you are looking at the Duty Finder. At the top of the Duty Finder page, you can select between Regular Duty and High-end Duty. By selecting High-end Duty, you will find the most recent Savage raid tier, in this case E5-8S, the most recent Extreme Trial, in this case Cinder Drift Extreme and the Ultimate Fights.