there's a chance you might need to downsize the enclosure and get him to eat. this method written by Deborah is her tried and true method for new hatchlings and young snakes. read this over and see if it is an option for you. and remember: it's temporary.
that is a large swing. how are you controlling your UTH? ALL heat sources MUST be regulated by a thermoSTAT or other type of electronic control.
2 identical cave-like (one opening) hides is S.O.P. for ball pythons. they need to be TIGHT and almost fit like a shell. the reason for identical hides is so they don't favor one over another and sacrifice thermoregulating for security.
good!
most definitely.
knowing the weight of the snake is the best way to determine overall health and monitor their growth. please get a scale.
this is the only exception to that guideline.