With you feeding Bml, you SHOULDN'T experiment or give a wide range of variety.
Bml has a specific list of fruits n veg that needs to be fed with it and it's strict for a reason.
Are you sure the glider/s aren't eating them ? like with peas, they will only eat the insides and leave the round shell, sometimes you literally have to pick it up and feel if there is anything inside or not. They don't eat the pod of green beans they only eat the middle part of the actual bean and leave the skin and pod behind.
Corn is the same they only eat the middle and leave the shell or skin.
Are you measuring how much fruit n veg you give them? Sometimes I get heavy handed and put to much on the plate, this leads to my gliders not eating as much so I have to measure everything out so I don't over feed.
Also keep in mind, in heat, moon phase, weather, change of seasons etc.. will affect their appetites.