[1.19.2] - Forge: Model in first person view fails to copy Player's Hand Animations.

So I'm working on a clothing mod and the idea is that there's an armor that in it's 3D view covers the players main arm and I basically want when I wear this armor for it to also show in first person that the player's arm is covered in this model too. So basicaly what I wanted to do is copy the player's arm model and simply make it copy his main arm's animations. However I've found out that it doesn't do it properly at all & the animations are very chunky? Here's The Code so far.