Changing the color of armor with ProtocolLib

ColorChanger.java

package com.comphenix.example;

import java.util.logging.Level;

import net.minecraft.server.NBTTagCompound;

import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.craftbukkit.inventory.CraftItemStack;

import org.bukkit.entity.Player;
import org.bukkit.event.Listener;
import org.bukkit.inventory.ItemStack;
import org.bukkit.plugin.java.JavaPlugin;

import com.comphenix.protocol.Packets;
import com.comphenix.protocol.ProtocolLibrary;
import com.comphenix.protocol.ProtocolManager;
import com.comphenix.protocol.events.ConnectionSide;
import com.comphenix.protocol.events.PacketAdapter;
import com.comphenix.protocol.events.PacketContainer;
import com.comphenix.protocol.events.PacketEvent;
import com.comphenix.protocol.reflect.FieldAccessException;
import com.comphenix.protocol.reflect.StructureModifier;

public class ColorChanger extends JavaPlugin implements Listener {

    private ProtocolManager manager;

    public void onLoad() {
        manager = ProtocolLibrary.getProtocolManager();
    }
    
    @Override
    public void onEnable() {
        manager.addPacketListener(new PacketAdapter(this, ConnectionSide.SERVER_SIDE, Packets.Server.ENTITY_EQUIPMENT) {
            @Override
            public void onPacketSending(PacketEvent event) {
                try {
                    PacketContainer packet = event.getPacket();
                    StructureModifier<ItemStack> items = packet.getItemModifier();
                    
                    ItemStack stack = items.read(0);
            
                    // Only modify leather armor
                    if (stack != null && stack.getType().name().contains("LEATHER")) {

                        // The problem turned out to be that certain Minecraft functions update
                        // every player with the same packet for an equipment, whereas other
                        // methods update the equipment with a different packet per player.
                        
                        // To fix this, we'll simply clone the packet before we modify it
                        packet = clonePacket(event.getPacket());
                        items = packet.getItemModifier();
                        event.setPacket(packet);
                        
                        // Color that depends on the player's name
                        String recieverName = event.getPlayer().getName();
                        int color = recieverName.hashCode() & 0xFFFFFF;
                        
                        // Write back the changed object 
                        items.write(0, setColor(stack.clone(), color));
                    }
                    
                } catch (FieldAccessException e) {
                    getLogger().log(Level.WARNING, "Cannot read field.", e);
                }
            }
        });
    }
    
    // Should probably be included with ProtocolLib
    private PacketContainer clonePacket(PacketContainer packet) throws FieldAccessException {
        PacketContainer copy = manager.createPacket(packet.getID());
        StructureModifier<Object> source = packet.getModifier();
        StructureModifier<Object> destination = copy.getModifier();
        
        for (int i = 0; i < source.size(); i++) {
            destination.write(i, source.read(i));
        }
        return copy;
    }
    
    private static ItemStack setColor(ItemStack item, int color) {
        CraftItemStack craftStack = null;
        net.minecraft.server.ItemStack itemStack = null;
        
        if (item instanceof CraftItemStack) {
            craftStack = (CraftItemStack) item;
            itemStack = craftStack.getHandle();
        } else if (item instanceof ItemStack) {
            craftStack = new CraftItemStack(item);
            itemStack = craftStack.getHandle();
        }
        NBTTagCompound tag = itemStack.tag;
        
        if (tag == null) {
            tag = new NBTTagCompound();
            tag.setCompound("display", new NBTTagCompound());
            itemStack.tag = tag;
        }

        tag = itemStack.tag.getCompound("display");
        tag.setInt("color", color);
        itemStack.tag.setCompound("display", tag);
        return craftStack;
    }
}

This method appears to be nullified in 1.9.2 ~ ProtoclLib 3.7.0-BETA. No errors, but leather armor is unchanged.