Just because only 75-150 stories are actually updating, doesn't mean that there isn't any traffic caused for the other stories. There are hard coded sleep times for some adapters, IIRC fanfiction.net is one of them -- if there weren't, you would very quickly see errors regarding incomplete responses, aborted connections or other HTTP errors.
Instead of wasting several hours of time and gigabytes of traffic once or twice a month, you might as well take the time to set up alerts for all your fanfiction.net stories once, and then only take 1/10000 of the time and traffic when using the email feature.
Several pages back I've also published a script that should be able to do this process for you unsupervised in a fraction of the time. If you are really interested in getting this to work, figure out how to use it. The downgrading "solution" will only work for the amount of time that fanfiction.net's site layout doesn't change (or any of the other sites you are using FFF for), as soon as it does you are out of luck, unless you want to manually update your own branch of FFF.
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