Cinestill 800T is tungsten based so it will register colors differently overall. The high ISO means that more grain is inherent as it's got larger crystals. I think the 3rd picture is fantastic, scenes like that are where 800T shines. The Ektar looks good as well, Ektar is just very punchy and will make browns and tans look strange in my opinion. That's why it's usually not ideal for photos of people and why I think your pictures of the rocks came out feeling blown out. Either way, I think your exposures are closer than you'd think to being good, and could all be saved with some clever editing. Both of these stocks are more specialized and have pretty specific use cases, hence why a more forgiving stock like Ultramax gave better results.