When you mean one file with multi parts are you talking like split rar files and an sfv? Or are you trying to download the same file multiple times via the same account but just pieces of it to speed the downloading? I'd like to think either of those cases should work fine, and you just got unlucky quickly in your test with the fast retry time forcing lots of connections... Can you run that test a few times to prove it always dies or if it's random?
Yes, BNCs should be added to the immune host list so they can't ever be banned. Does your BNC forward the ident to the server via the IDNT command? Perhaps that might be a place to look for a corruption issue since I don't test that...
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