If the mice you are feeding are only 8g, those are more fuzzies than anywhere near adults. Most 140g ball pythons can easily take 25-30g adult mice. Both of my girls from last year are eating rat pups that weigh anywhere from 20-29g.
I noticed, when we took in a foster snake for the local Herp society, that the "adult mice" they bought from the pet store were really more fuzzy sized. I'd go look at the live mice they sell and compare one of those to the ones you bought frozen. I bet you'll be surprised!
If the mice you have are truly 8g, I'd suggest feeding your snake two or three at a time if s/he will take them, otherwise keep the feeding to every 4-5 days.
For a good comparison on rodent sizes, check out the Rodent Pro website. Here's a link directly to their mouse page:
RodentPro mice sizes
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