Devils are not chaotic, they're lawful. (Devils are Infernal) Otherwise, this sorcerer enhancement looks in every way superior to the PHB sorcerer and I like it.
The very nature of an angel is an artificial being. An angel is not 'born', he is 'created'. And because the angel is 'created', it follows that he has a 'purpose'. He has a 'reason to exist'. Therefore, if an angel suffers, there is a reason for his suffering.