Glad you find the mission interesting. If you want to change any of your preferences (weather changes, time of day, aircraft, or similar), use VIPER TALK-DOWN C-101EB.miz. 

The VIPER TALK-DOWN - C-101EB Bad weather file is less suitable for this due to a few “quirks” in the script.

Otherwise, always remember that the “unitName” must remain Viper1.

Have fun :) Best regards, Luicia.