I'm analyzing Perl

Could you be more specific? Are you hunting bugs in ExtUtils::Installed? Because that's what this issue feels like to me at the moment, although I still don't have enough time to investigate in detail.*

If you're not hunting bugs, perhaps you could explain what exactly you've analyzing and why, then we could probably suggest more fitting tools. If I guess you might be trying to figure out which modules are installed and which files belong to which distributions, then why not just use one reliable tool (maybe that's Module::Metadata?) instead of trying two?

You also haven't said if you need to figure out distribution names as well; in this node there appears to still be a mixup of distribution names (MIDI-Perl) with actual modules (MIDI/MIDI.pm).

* Update: See my post here, looks like a bug to me.