Zombie speed and/or behavior Modification

I wanted to know, how can i modify Zombie Speed/Behavior modification with a zombie using a minecraft plugin. I studied a little, and i found some tutorials, but they were unclear, and alot of the code has errors. Here is the code i am trying to use, any help on how to get it to work, or on any other ways i could use would be nice.
Here is the Separate SuperZombie class:

Code:

public class SuperZombie extends net.minecraft.server.EntityZombie {
    public SuperZombie(World world) {
        super(world);
        this.bw = 0.28F;  //Change this to your liking. This is were you set the speed
        this.damage = 5; // set the damage
//Theres also a ton of options of you do this.  play around with it
     
 
        try {
            Field gsa = net.minecraft.server.PathfinderGoalSelector.class.getDeclaredField("a");
            gsa.setAccessible(true);
 
            gsa.set(this.goalSelector, new UnsafeList());
            gsa.set(this.targetSelector, new UnsafeList());
        } catch (SecurityException e) {
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
 
        this.goalSelector.a(0, new PathfinderGoalFloat(this));
        this.goalSelector.a(1, new PathfinderGoalBreakDoor(this));
        this.goalSelector.a(2, new PathfinderGoalMeleeAttack(this, EntityHuman.class, this.bw * 1.9f, false)); // this one to attack human
        this.goalSelector.a(3, new PathfinderGoalMeleeAttack(this, EntityVillager.class, this.bw, true));
        this.goalSelector.a(4, new PathfinderGoalMoveTowardsRestriction(this, this.bw));
        this.goalSelector.a(5, new PathfinderGoalMoveThroughVillage(this, this.bw, false));
        this.goalSelector.a(6, new PathfinderGoalRandomStroll(this, this.bw));
        this.goalSelector.a(7, new PathfinderGoalLookAtPlayer(this, EntityHuman.class, 8.0F)); // this one to look at human
        this.goalSelector.a(7, new PathfinderGoalRandomLookaround(this));
        this.targetSelector.a(1, new PathfinderGoalHurtByTarget(this, false));
        this.targetSelector.a(2, new PathfinderGoalNearestAttackableTarget(this, EntityHuman.class, 8.0F, 0, true)); // this one to target human
        this.targetSelector.a(2, new PathfinderGoalNearestAttackableTarget(this, EntityVillager.class, 16.0F, 0, false));
    }

Here is the part that goes in the onEnable Section:

Code:

try{
            @SuppressWarnings("rawtypes")
            Class[] args = new Class[3];
            args[0] = Class.class;
            args[1] = String.class;
            args[2] = int.class;
 
            Method a = net.minecraft.server.EntityTypes.class.getDeclaredMethod("a", args);
            a.setAccessible(true);
 
            a.invoke(a, SuperZombie.class, "Zombie", 54);
        }catch (Exception e){
            e.printStackTrace();
            this.setEnabled(false);
        }

And Here is the event to spawn the zombies in as regular:

Code:

@EventHandler
    public void onCreatureSpawn(CreatureSpawnEvent event){
        if (event.isCancelled()) return;
 
        Location location = event.getLocation();
        Entity entity = event.getEntity();
        CreatureType creatureType = event.getCreatureType();
        World world = location.getWorld();
 
        net.minecraft.server.World mcWorld = ((CraftWorld) world).getHandle();
        net.minecraft.server.Entity mcEntity = (((CraftEntity) entity).getHandle());
 
        if (creatureType == CreatureType.ZOMBIE && mcEntity instanceof SuperZombie == false){
            SuperZombie bloodMoonEntityZombie = new SuperZombie(mcWorld);
 
            bloodMoonEntityZombie.setPosition(location.getX(), location.getY(), location.getZ());
 
            mcWorld.removeEntity((net.minecraft.server.EntityZombie) mcEntity);
            mcWorld.addEntity(bloodMoonEntityZombie, SpawnReason.CUSTOM);
 
            return;
        }
    }

I know that the CreatureType is deapreciated, but even with using EntityType theres still even more errors. Any help with this would be very nice.