To enhance contrast while maintaining the menacing and sci-fi vibe, here’s a revised color palette that incorporates more striking contrasts alongside your existing colors:

 <High-Contrast Sci-Fi Palette>
1. Deep Black - 
          
          #000000
        - An absolute black that provides maximum contrast and a dramatic backdrop.
2. Neon Red - 
          
          #FF3D00
        - A vibrant, luminous red that intensifies the existing red and adds an electrifying touch.
3. Electric Cyan - 
          
          #00FFFF
        - A bright, striking cyan that contrasts sharply with the warm tones and complements jade green.
4. Toxic Green - 
          
          #39FF14
        - A vivid, almost glowing green that enhances the sci-fi aesthetic while contrasting with the grey and red.
5. Dark Purple - 
          
          #4B0082
        - A deep purple that adds a sense of mystery and complements the existing colors with a cool tone.

This palette provides high contrast, making each color pop and enhancing the overall menacing and sci-fi feel of your design.

Would you like suggestions on how to use these colors in a specific project, or are there any other adjustments you’d like to make?