Alexthibo.

Is the problem on a LIVE site?
If it is, rather than spending time chasing for a solution I would personally take a different approach.

NOTE: You may already have set up a test site and a live site separately, but if not read on.

When I had a problem that I could not figure (not with ZenCart - but same principal), this is what I did.

- Install a second 'testing' copy of the package.
- Configure exactly the same as the live copy - but without any plugins.
- Add a couple of products and test it all works.
- Add first plugin - test
- Add second plugin - test again
- etc until the problem plugin is found or all plugins added successfully.

This should not take long because adding plugin files is simply an upload, and there is no need to edit all the individual files needed for each plugin - just copy them from your live site.
When a problem appears on the site or it breaks you know that the last installed plugin is the culprit and you can check that to ensure it was installed properly.

I did this on a site that had a package with 12 plugins, and the problem showed up on the third one, but even installing them all would have not taken more than an hour.

Of course this all assumes you have access to add a second copy on the server.
NOTE: Use the same database with a different table prefix.

Now I always do 2 installations of a package from day one - it may take a little longer to set up, but it can save a lot of time and trouble if things go wrong.