I would guess it is probably all the fillers, the HK and the pumpkin. Pumpkin, egg, and yogurt can also cause runny sloppy poops.
You shouldn't need the HK if you are feeding a complete prepackaged raw like the NV nuggets. I would ditch the HK, and do prepackaged. You can buy patties or chubs to save money. Chubs you have to cut up, patties are easy though. I prefer Primal or OC Raw over the NV personally. Green tripe would also be a good choice to throw in the mix. I would even cut the yogurt and the pumpkin and do a whole egg including the shell maybe once or twice a week.
In PA you should be able to get a product called Blue Ridge Beef. They have good stuff.
A RMB bone, like a turkey neck, would help to firm up stools and I think are important to add in order to keep the teeth clean and allow those dental/jaw benefits. You can add 10-30% of the raw food diet when using prepackaged. Primal has a pretty good calculator on their webpage.
Good luck, let me know what you decide!