Where exactly are you? I can not help with the FoV section of the game, but if you are still in D2:ED I may be able to offer some advice.
Have you tried lowering the difficulty in the options? I believe that is suppose to add more time for the final mission in FoV and make the zeppelin tougher.
If there are any side quests you can do first, or any areas left to explore, leaving main quests until later usually helps.
Welcome to the forum.
