Nice pick-upsA little patience is all it takes.
Get yourself a little Critter Carrier and house your refusals in there for a few days and try again. I always buy a few extras to feed during the week on a few sub-adults that I'm trying to plump up. Just don't mix refusals from a QT animal in with refusals from your established collection.
A few pick-up's I had that were well started refused for a while. They just need to get used to the new environment. I have had zero problems with hatchlings feeding no matter where I have picked them up from. Sometimes the hatchlings will outgrow a well started animal due to the time it takes them to get comfortable. I have a 550g Black Pastel 100% Het Pied that refused for 3 months after I got him. I really wanted to pull my hair out. He lost 50g, but is now eating like a champ every week and is well over his original arrival weight.