Don't convert AZW3 (KF8) to ePub. Use the KindleUnpack plugin to shift the KF8 code to ePub. Then use Calibre's Edit book to check the code and fix any errors found. Once it's error free, you'll have an ePub that matches the AZW3 as close as possible. There won't be any changes in the code except for what you have to do to fix any errors. There will be some errors as AZW3 is not 100% the same as ePub but it's close enough and it's not hard to fix things.
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