I don't use any fancy flight station just a Logitech joy stick and I do not have any specific 'default flight' other than the one I'm testing and saved at the time, which can vary daily or even hourly. Mostly bouncing between CS and A2A Accusim models, as such my 'realism/automixture' is permanently set DISABLED.

I rarely load a flight from the FSX boot screen rather than 'Fly Now' the default flight then load the flight, no matter - what - where - model - or saved state from the drop down menu.

Works for me!  ;) That includes a CS B77x Cold and Dark flight from a A2A B377 COTS Cold and dark or mid flight or whatever.