Ckuhn003,
Phantom looks awesome. Glad he is doing well and settling down for you.
I think he's going to be an awesome and docile guy for you. You just needed to give him some time and not overwhelm him.
If he's still chill for another few weeks, you can probably go to holding him 3-4X a week instead of 2-3X. You can also try holding him for up to 15 minutes instead of 10, etc.
I think you know how to read him now and he's demonstrated he appreciates the respect and care. Keep up the good work.
By the way, if you think he's strong now, just wait!