Congrats on the band ! As for the weight changes in the birds, most likely juvies! Sounds like you called in a family group, two adults and 3 birds born this year! Also most of the banded birds in the early season that you shoot are resident birds,so they will have been banded here! A lot are banded in Panten Vt! We have a really good banding program here and if you make it known with the biologists in Addison, you can get in on a banding trip with them in the summer which is really cool!
Again congrats on your first band, your improved calling,and the new found ability to call birds!