Why Hungry Lion Outlets Have Varying Levels of Quality?

This might be my own subjective experience, but everytime I've thought of getting a Hungry Lion pack, the decision is often location specific due to the inconsistency in taste and quality from each outlet. This is something I don't face a lot with KFC because they seem to have a consistency that is lacking with their competitor (probably due to having a longer purse string and operating for much longer). The most favorable joints I've enjoyed a Big Bite was one along Freedomway, Society Business Park (before the shut down) and WaterFalls mall because their fries and chicken tasted fresh. The worst ones I was was the ones served at Lewanika Mall, Engene along Chilimbulu road and Novare (close to Heroes Stadium). What has your experience been in regards to the taste and quality of this popular fast food meal?