As with any live animal they are each individuals and will attain different sizes even with similar feeding schedules. I have dozens and of course see more of the ends of the bell curve.
Both adults sound like typical size, like you said it's more of how they are filled out thing, not exact length and weight. For the most part I don't measure length. Always hard to get an accurate measurement. I do use snakemeasurer.exe a program where you can determine the length of a snake from a picture. The pic has to be direvctly overhead and have a known lenght object in it. Use the known object to set the scale and then draw a line by defining a series of points along the spine.
Not sure on the yearling, how many months old? I can weigh some of mine when I get home tonight.
-----
Thanks,
Dave Colling

www.rainbows-r-us-reptiles.com
0.1 Wife (WC and still very fiesty)
0.2 kids (CBB, a big part of our selective breeding program)
LOL, to many snakes to list, last count:
26.49 BRB
20.21 BCI
And those are only the breeders 
lots.lots.lots feeder mice and rats 

