[cypher]

It can take some time for them to adjust to a new cage, some hams even up to a couple of weeks while others adjust more quickly so you need to give him time to get used to things & you may see changes in behaviour for a while, don't worry about that, just let him settle & don't do anything other than spot cleaning pee for a few weeks at least.
Burrowing down to sleep is quite normal, what kind of house does he have? Something around shoebox size with no base so they can burrow down under that is ideal, plastic houses aren't the best, wooden houses are good but do need plastikoting inside, a cardboard box with no base & a door cut in can make a great house.
Don't worry about him tipping the bowl, you can scatter feed anyway so they don't actually need a bowl & foraging is natural behaviour for them & keeps them busy!