"from broken Entity-stacking this plugin got it all"
I have no idea of what are you talking about. ServerBooster has no entity stacking system (which are useless and break the vanilla gameplay totally). What ServerBooster does is disabling AI of entities if it's not needed, this speeds up the server incredibly by reducing CPU load.
I'm afraid I didn't get any issue report from you during the months you're referring to.
You're free to open DETAILED issues report on GitHub like every other customer did in the past, I'm always happy to dedicate myself into fixing the compatibility with different server setups.
https://github.com/PluginBugs/Issues-ServerBooster/issues
Have a nice day, and I hope you'll change your mind about the review.