Resize custom entity using playermodel

I'm currently working on a purely clientside mod that implements small clay goblins that follow you around. For that I created a new entity named ClaySubEntity.

For rendering I am using a custom renderer with the vanilla PlayerModel.

But because the playermodel is too big, I scaled them using:
 

@Override
public void render(ClaySubEntity entityIn, float entityYaw, float partialTicks, MatrixStack matrixStackIn, IRenderTypeBuffer bufferIn, int packedLightIn)
{
    entityModel.isSneak = entityIn.isSneaking();
    matrixStackIn.scale(entityIn.getScale(), entityIn.getScale(), entityIn.getScale());
    super.render(entityIn, entityYaw, partialTicks, matrixStackIn, bufferIn, packedLightIn);
}

That works completely fine, only the hitbox stays the same size. So when I hit above them, they still die. https://imgur.com/a/6lQMfPf (Note I'm hitting above).

Is there a better way to scale down an existing model without breaking the nametag or hitboxes?