Young Budgies 2 - Loose Little Feathers Daily But Look Healthy

Hi - 2 questions -got 2 very young male budgies about 7 or 8 months ago. In a flight cage. We let them fly 2 or 3 times for hours weekly.

We feed them fresh veggies daily -like broccoli (They love), celery leaves, strawberries, carrots, apples, also of course

seed mix.

Almost daily - we vacuum little feathers on floor around cage. Thought at first - molting. But it's almost everyday.

1) How can they lose so many feathers and still look so good and healthy?

2) Also, we try to get them to go on our finger or

let us touch them gently, but they are STILL afraid of us. Play talk to them & music for them daily too. What else can we do?

Thanks