As far as temp goes if you are comfortable then he is comfortable. The temp ranges you mentioned are well within normal ranges. He can regulate his internal temp by locking feathers on his down coat or loosening them up. So as long as you keep him out of breezes and drafts he can handle it.
His dependence on you may be an issue if he plucking when you are away. But he is young so the dependence may lessen as he grows more confidence with his world and his flock and if you work on getting him a bit of alone time so he understand you being away is not forever and will entertain himself during that time.
His dependence on you may be an issue if he plucking when you are away. But he is young so the dependence may lessen as he grows more confidence with his world and his flock and if you work on getting him a bit of alone time so he understand you being away is not forever and will entertain himself during that time.