you've had your bird less than a month, is that right? (i tried to go back and see when you started posting and get an idea, but i'm still learning the new features...) he's probably still settling in and getting used to his new surroundings, and typically during this period you won't have such a vocal bird, and maybe he won't be eating as much due to the stress of the change. maybe he's eating when you aren't looking. some birds take longer to acclimate and feel secure than others, so i wouldn't worry yet. you also have to understand that each bird has his own unique personality, so maybe he's not going to be as vocal as you are expecting.
our birds are vocal at different times throughout the day, but they do have times when they are completely quiet too. like now. aside from an occasional squawk or bell jingle, i wouldn't know i had 2 boisterous quakers in the house. i know my usually talkative self has moments where i'm pretty mellow and quiet too.
just give him time to figure out his place in the family and i'm sure you'll be back with stories about how vocal he is. i think you are doing ok, and he's just taking his sweet time before he lets you know his personality.