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Here I debug with a small code that displays attributes of LivingEntity on PlayerInteractEntityEvent:

It still does not have exactly 200 hp and 8 damage when spawned via command but very close.

Config:

CatAllBlack:
  Type: WOLF
  Tameable: false
  Display: '&8Vantablack'
  Health: 200
  Damage: 8
  LevelModifiers:
  - health 5
  - damage 1

My code:

MobManager mobManager = MythicMobs.inst().getMobManager();
ActiveMob activeMob = mobManager.spawnMob(petCode, spawnLoc, petLevel);
AbstractEntity entity = activeMob.getEntity();
Tameable pet = (Tameable) entity.getBukkitEntity();
pet.setSilent(true);
pet.setTamed(true);
pet.setOwner(owner);
pet.setCustomNameVisible(true);

// health
int maxHP = (int) (pet.getAttribute(Attribute.GENERIC_MAX_HEALTH).getValue() + 0.5);
GuardiansOfAdelia.getInstance().getLogger().info("Pet maxHP: " + maxHP);

The last line in my code says 20 health too.