Unless my eyes are deceiving me, I don't see perlmodstyle in your list, which is a very good resource.

Additionally, if you intend to upload to CPAN, I recommend reading the CPAN Author's FAQ, and About PAUSE (even if you're not uploading to CPAN, there's useful advice).

Once you're confident enough in your own good judgement to not be blindly influenced by the book, Perl Best Practices (O'Reilly) is useful. But most people seem to ignore the instructions early in the book telling authors that these guidelines are more intended to "get you thinking" than to "tell you what to do." In practice, it seems the opposite happens; the "best practices" are trotted out as a crutch to excuse coders from thinking for themselves. With that caveat, I still think it can be helpful to read through it and try to understand what issues are being addressed, and where the suggestions are (and are not) appropriate.