i have found that the more "engaged time" the better - meaning talking to Joey with good eye contact, asking him questions, treating him like a person if you can. Use alot of enthusiasm in your voice when you do - and GOOD EYE CONTACT.
If you are busy and cannot sit and talk to him forever, then when you are at your desk or wherever you sit, have him with you as much as possible, in or out of the cage. Closeness measured in inches really matters.
You are doing well. Praise him alot. Talk sweetly. Sometimes offer him a treat from your hand but not always.