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Well first and foremost you are using NBTTagCompound for whatever god unknown reason. Don't use it, NBT is for (de)serializatio only. Any particular reason you are using boxed values? You should not be doing that. What does this do? You have a DataManager class for syncing entity related data. Use it. Don't reinvent the wheel. Since models are singletons you must either include an else with default rotations or reset the rotations. Otherwise the moment attacking is true for one entity the model changes for all of them. Which is your issue.

KeyBinding is a way of registering and detecting key presses in minecraft. As a side effect it also makes your key rebindable. To start you would need to construct a new instance of KeyBinding. Use the forge provided constructor. Then you need to register the keybinding using ClientRegistry.registerKeyBinding. Finally you can use KeyBinding#isPressed to detect whether the keybinding was pressed or KeyBinding#isKeyDown to detect whether the key is currently pressed.

Check your GitHub

The problem with most alternative mod loaders, is that they are created out of spite with "Fuck Forge" as their motivation. But then they use our tools, our data, and our work to make their system. That's the thing that pisses me off about things like Rift. I have not looked at Fabric so i can't comment on what they are doing, or if they are doing it correctly/legally. However, I would also advise against using any loader that "gives the hooks to the users", by "exposing" mixins and encouraging the average user to use it. Because that flat out won't work. The reason Forge has compatibility with so many mods is because we've cultivated all the internal hooks as clean changes that make it so modders DON'T have to break things in MC code to make their mods work. So you can get a couple nice mods yes, but it'll become difficult when you start trying to create modern mod packs. As for updating to snapshots. I update the mappings internally when I get time cuz I like seeing what has changed. I would LIKE to make those mappings public but it isn't worth doing as they are not the highest quality and we loose a lot of information. I am looking for people who are willing to help create open source versions of some of the internal tools I use {which I did not create and thus is not my place to release} as well as a better three way binary mapping generator.. If anyone actually wants to help out on that, hop on discord either Forge's or sponge's and we can talk... Anyways, using 3rd party smaller loaders just to explore the new vanilla code is fine. But do not expect stable or useful releases from those.