I'm not up on all the particulars of dwarf Burmese pythons so I can't tell you if there are any distinguishing characteristics or not.
Personally, I think it's possible, but not very likely, that you have a dwarf, considering everything you said in your first post. If it came from an importer the odds are that it would've been labeled as one (higher value). Another thing, I don't think there's that much of a difference between a full-grown dwarf and a full-grown normal Burmese. I'm talking about the difference in the size of your Burmese and the typical size of either one of the two types at the same age and typical feeding regimen.
Your snake's size is dependent upon it's genetics & personal metabolism, the latter of which is largely controlled by you - mainly your feeding regimen & caging temperatures. There's an old wives' tale that a snake (or reptile) will only get as big as its cage allows. That's entirely false.
Unless the chicks you're feeding it are a few months old, at least, I don't believe it's getting near enough food. Is there a special reason you're feeding your snakes baby chicks instead of rodents?
Look through the several pages of threads here in this forum for other "dwarf" threads. I think there's one or two threads within the 4 or 5 pages that talk about dwarf characteristics.
Take care!
HH
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Due to political correctness run amuck,
this ol' hillbilly is now referred to as an:
Appalachian American

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