Dave, what about uncooked foods for the four or five days - that way you can ditch the cooking gear and fuel and put that weight into extra food. I recall you mentioned you always want a hot drink in the morning, but the extra calories could give you the edge. You could always boost your morning water by adding an energy supplement too. (Just think 'nice cup of tea' while your slugging it!)
Out of interest, here are some calorie values I got off a lightweight site. (unverified)
Dried fruits (I believe papaya packs a wallop) and mixed nuts seem to be 'tasty' powerhouses. Be fairly monotonous going 'uncooked' but it'd only be four days and you'd survive, and it'd maybe help you achieve your goal. Just a thought.
Cheers, Geo.
These are calories per ounce...
Olive oil.................240
Nuts, mixed..........170
Almonds................165
Peanuts.................160
Peanut Butter.......160
Tortilla Chips..........150
Potato Crisps........150
Chocolate.............140
Snickers Bar..........140
biscuits................130
Ramen Noodles....130
Cereal...................110
Crackers...............110
Granola................110
Noodles...............110
Pasta....................110
Sugar......................110
Fruit, dried............ 90
Raisins................... 90
Cheese.................. 80
Beef Jerky.............. 70
Bread..................... 70
Dried Vegetables... 70
Fruit........................ 20
Vegetables.............. 10
.