To add a little more,
A larger carpet will not weigh what a larger boa will weigh. Nor will a carpet that's a foot longer than a boa rival the density of the boa.
Prey size rather than feeding frequency will contribute more to end size. There is a study that looked at certain populations of the same species and found the snakes that lived in areas with larger prey were ultimately larger. I wish I had the study handy. I think it was within rat snake populations.
Looking at the SD and Dwarf retics, you can also note the snakes are smaller in areas where large prey isn't available.
I would like to see a study in carpet pythons like that.
At this stage my Southern, "Brissy" is smaller than my costal mix was at a similar age. My late mix didn't eat very often at all, yet she grew to 8+ feet. Her spurt was later in life. Probably because when I did feed her, I offered fairly good sized prey.
I wouldn't get too hung up on size. The norm is NOT 9-10'. I'd say an 8 foot carpet is a good sized captive snake, and actually it is a size that is easy to handle.
Nick Mutton has some beautiful animals as does Mike Pennell. JM has some other leads you may want to look into.
I can't recommend the carpet group enough. They compliment boa ownership.
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