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I'm sure you've probably already done this, but running your domain through https://mxtoolbox.com/ can maybe provide insight as well.

Yes, the team said those features will be gradually added soon.

Actually no, only one minification would happen. Current implementation just takes the very first hook int the list and use that one. So, if you just installed the module after the standard module was installed, its hook would never be called. You could "fix" that by changing the hook orders in Modules > Positions, but nobody would do that (or know about it even) So yeah, we really should have an option to select which implementation should be used.

Interesting - will try over the coming days!