the behavior you describe definitely sounds like the snake is hungry and a bit stressed from it. i'm just going to go through your info and try to address what i can.
even though the snake isn't eating right now, you need to up the prey size. follow the feeding chart below.
has the snake eaten for you since you've had them?
hatchlings usually do better with a slightly lower hot spot temp around 88-89° F (31° C) but your temps sound good. maybe try lowering the hot spot temps a bit.
continue to do so until the snake is eating regularly.
what's the L x W x H of the enclosure? you might need to move the snake to an even smaller tub. i have Coffee Bean (90g+) in a 15 quart tub with almost comically small hides. what is the behavior when a prey item is presented? does the snake poke out then retreat, or is there 0 interest?