I may have missed it but I do not understand why you need to feed more protein if you are feeding HPW, they should be getting enough with HPW. The LGRS Soup calls for side protein regularly so you might want to change to it since it asks for it.

You can provide protein through many sources.

Edamame
Quail Eggs
Eggs
Pumpkin Seeds
Crickets
Grasshoppers
Turkey
Feeder Fish
Pinkies
Mealworms
Wax Worms
Calci Worms or Pheonix Worms, or Repti Worms
Silk Worms
Moths
Pistachios
Spirulina
Chicken
Fish
Yogurt
Sprouts including Quinoa, Lentils, Mung Beans, Chickpeas, etc.
Superworms
Sunflower Seeds
Anoles
Peanut Butter
Almonds
Beans
Brown Rice