The “Remove render-blocking JavaScript” is a quite common message even with the default settings. For example, jquery loading is blocking and that’s default in most wordpress themes.
Are you sure that message was not there before activating my plugin?
If you are (really) sure… you can go to the settings (on my plugin) and enable the “defer javascript” option. This will load javascript only after the page loading is complete and the message will be gone from the pagespeed insights, but be aware that if you need jquery anywhere in the page before the footer, then this might break some functionality.
If you see that something stopped working, simply disable that option again.
But in that case, that means you need that script to be blocking.
More importantly that this though, is the server configuration.
For example, you need to tweak:
Leverage browser caching, Reduce server response time, Size tap targets appropriately…
For the “Minify JavaScript” it seems you don’t have Java available or PHP exec so the files have been merged only. I am working on a next release that will use our own api for minification if java fails, so in the future this will be improved for those on shared hosting plans.
Currently, this plugin is still better on a cloud / vps environment, where you can customize the software that’s installed (such as java).
Also take a look at pingdom tools and gtmetrix for better insights.
