Hello I'm obsesed with 3D item rendering.
I've found some differences between my mod and yours in the ClientProxy
try to register the renderer like so (taken from my mod):
MinecraftForgeClient.registerItemRenderer(MagicItems.WoodenWand, new RenderWoodenWandItem());
also I usually do in my Item class both this.isFull3D(); and this.setFull3D(); in the constructor instead of the bFull3D = true.