Where are you storing your vac sealed bags? Even with store-bought jerky, I vac seal smaller portions of a larger bags and keep them in the lunch-meat drawer in the fridge. I go in phases, sometimes I really want jerky, then I'll go for weeks and months totally forgetting about jerky. I dont use desiccates and those small packs of jerky last for months and dont mold. I started doing that when I found mold in a large bag of store bought jerky (solid muscle jerky) I had opened and it sat for some time maybe a few weeks or more
I have never made ground meat jerky though. When I made jerky, it was always venison, hand cut and individually hand pounded with a spiked tenderizer, marinated and of course dehydrated. My homemade deer jerky never molded and I didn't refrigerate it back then either. I never used special chemicals outside of Worcestershire, soy sauce, lemon juice, hot sauce, spices.
I've had to do this with my son and grandson. Both have no limits or control if the food is right in front of them.
When I was making jerky, I used to make it so spicy there was a price to pay for eating it, just to slow people down, otherwise it would be gone very quickly. I love spice but it was even too spicy for me as a late night snack...which is also probably good so I dont sit there and eat it all myself washing it down with bourbon late at night!