[1.12] Custom Bow Rendering Transforms

I have searched for something up to date, and found nothing. All I am doing is trying to add a custom bow with a set of obj models. Everything works but the transforms are not showing as all. I have no control over the transforms, and when I look at the vanilla code the bow seems to have hard coded transformations. I know Tinker's Construct managed to make this work, but I can't figure out how they did it. 

Here's the blockstate I tried:

{
    "forge_marker": 1,
    "defaults": {
        "textures": {
        },
        "model": "magitech:bow_compound_model"
     },
    "variants": {
        "normal": [{
        }],
        "inventory": [{
            "transform": {
                "gui": {
                    "rotation": [ { "y": 0}, {"x": 0}, {"z": 0} ],
                    "translation": [ 0, 0, 0],
                    "scale": 2.0
                },
                "ground": {
                    "rotation": [ { "y": 0}, {"x": 0}, {"z": 0} ],
                    "translation": [ 0, 0.25, 0],
                    "scale": 1.5
                },
                "thirdperson": {
                    "rotation": [ { "y": 90}, {"x": 0}, {"z": 45} ],
                    "translation": [ 0, 0.475, 0.15],
                    "scale": 1.35
                },
                "firstperson": {
                    "rotation": [ { "y": 90}, {"x": 0}, {"z": 45} ],
                    "translation": [ 0, 0, 0 ],
                    "scale": 5.0
                },
                "fixed": {
                    "rotation": [ { "y": 0}, {"x": 0}, {"z": 90} ],
                    "translation": [ 0, 0, 0 ],
                    "scale": 0.9
                }
            }
        }]
    }
}

And the file it references (not sure why but it only looks in the block models for it):

{
    "model": "magitech:item/bow_compound_model_standby.obj",
    "textures": {
    },
   "overrides": [
        {
            "predicate": {
                "pulling": 0
            },
            "model": "magitech:item/bow_compound_model_standby.obj"
        },
        {
            "predicate": {
                "pulling": 1
            },
            "model": "magitech:item/bow_compound_model__pulling_0.obj"
        },
        {
            "predicate": {
                "pulling": 1,
                "pull": 0.65
            },
            "model": "magitech:item/bow_compound_model__pulling_1.obj"
        },
        {
            "predicate": {
                "pulling": 1,
                "pull": 0.9
            },
            "model": "magitech:item/bow_compound_model__pulling_2.obj"
        }
    ]
}

The rest is pretty basic, I tried using the vanilla transforms like this:

{
    "model": "magitech:bow_compound_model_standby.obj",
    "textures": {
    },
    "display": {
        "thirdperson_righthand": {
            "rotation": [ 0, 0, 0 ],
            "translation": [ -1, -2, 2.5 ],
            "scale": [ 0.9, 0.9, 0.9 ]
        },
        "thirdperson_lefthand": {
            "rotation": [ 0, 0, 0 ],
            "translation": [ -1, -2, 2.5 ],
            "scale": [ 0.9, 0.9, 0.9 ]
        },
        "firstperson_righthand": {
            "rotation": [ 0, 0, 0 ],
            "translation": [ 1.13, 3.2, 1.13],
            "scale": [ 3.0, 3.0, 3.0 ]
        },
        "firstperson_lefthand": {
            "rotation": [ 0, 0, 0 ],
            "translation": [ 1.13, 3.2, 1.13],
            "scale": [ 0.68, 0.68, 0.68 ]
        }
    },
    "overrides": [
        {
            "predicate": {
                "pulling": 0
            },
            "model": "magitech:item/bow_compound_model_standby.obj"
        },
        {
            "predicate": {
                "pulling": 1
            },
            "model": "magitech:item/bow_compound_model__pulling_0.obj"
        },
        {
            "predicate": {
                "pulling": 1,
                "pull": 0.65
            },
            "model": "magitech:item/bow_compound_model__pulling_1.obj"
        },
        {
            "predicate": {
                "pulling": 1,
                "pull": 0.9
            },
            "model": "magitech:item/bow_compound_model__pulling_2.obj"
        }
    ]
}

But all of them produce the exact same results, the model is rotated as a simple held/generated item. So why and how do I fix it? It only happens with the that have an override property, nothing else has had this problem (I've added a lot of other items with obj models already). If I extend Item or ItemBow, it makes no difference.