what to do?

[Babybird]

As you are probably all bored about hearing my reluctant flyer stories I know have a pleasant surprise after my birds only ranging 5-10 mins twice a day, today I decided to feed them as I thought I was going out so they couldnt, well I stayed in and decided to let them out anyway even thought I had fed them..... they ranged around for an hour!!! and came in no problem. Funny I thought, try that again at tea time, so I fed them and yep you guessed it 1 hour 20mins, came in no problem. Bearing in mind that these are going to be used for my release business (of which I had my first service yesterday, complete sucess from 5 miles ) do you think I should carry on feeding them before I let them out?  I think they were too hungry to fly :-/