I always error on the side of too much than not enough. Nothing worse than running out of food. The Factor on amount of food to prepare depends on age and sex of consumers and cook shrinkage. I start with an average and adjust up and down if the age/sex of croud is biased. From an average mix, I would also say you are light on your Pork by about 10 lb of starting weight (50 Total). I would also say you are about 5 lbs light for your slaw and salad (25 Total) as I figure 4oz each for 2 sides.
Those would be my starting place and adjust down for real Young or Real Old and More females. Adjust up for Men and even more for teenage boys (Garbage Disposals).
Hope that helps...
Big Jim - Newnan, GA
Customized Lang Model 84 Longneck