8,000' DA??
Have to do better than that, I'm afraid.
Is that 8,000' Pressure Altitude, ISA (which would be -1C), or something else?
12,000' PA, -40C, or 4,000' +40C - makes a huge difference to the engines, you know.
With turbine engines you can't just talk about a density altitude, especially for something like Category A where you are going to be engine limited.