Please post any suggestions you have to make these encounters a challenge, yet enjoyable and doable for the majority, without having to have a coding degree for MQ2.
Since the content isn't new I guess no harm in sharing some spoilers on these evil encounters and how they supposed to work.

# Master Vule:
On engage spawn 12 Sentient Watchers (Gargoyles) around the room. At 95,90,85,80,75,70,65,60,55,50,45,40% one of them will turn red and the players must Depop that one. If they fail to Depop the Watcher in 60s, then the Watcher will wipe hatelist and path to the center of the room and sacrifice his life for Vule. Vule will then gain 25% HP and 50% DPS.
Vule will be HP locked at 94,89,84,79,74,69,64,59,54,49,44,39% until the gargoyle is either Depoped or sacrificed.
At 35% Vule will knockback all players into back of the room except the main tank. If anyone except the main tank comes within 100ft of Vule then Vule will Life tap 100% of their HP onto himself*100 (50kHP = 5Mil). Ranged/Spell casters must take him down to 20% in which he will stagger and fall to the ground (similar to normal vampires).
When vule is Staggered on ground, players must stake him 50 times in 30s. If you fail to do that then he will regenerate to 40% HP and reset on the Ranged stage again (@35%). Each time he regenerates Vule will also gain 25% DPS and drain 35% Mana from the raid.
# Dorvias N'Keth, The Archpriest of Hate:
At 95, 80, 70, 60, 45, 35% HP, He will spawn different Hate disciples (Hate, Fear, Agony, Dread, Pain, Torture) up higher in the zone. These disciples will be doing a "ceremony" that lasts for 60s. If both disciples are not slain within the 60s, then Dorvias will gain 35% DPS and will gain an AE ability.
While Disciples are spawned, Dorvias will be HP locked at -5% (90,75,65,55,40,30).
Hate Ceremony: Every 30s for 6s Increase DPS by 50%
Fear Ceremony: Every 30s Stun All hatelist for 6s
Agony Ceremony: @Failure Set Max HP and increase DPS by 35%
Dread Ceremony: Cast on all clients: Blight of Hate (8269)
Pain Ceremony: Every 30s Mana drain all hatelist for 50% max Mana
Torture Ceremony: Every 30s Nuke all hatelist for 50% max HP
On Death of Dorvias make sure to heal all mobs of the Blight of Hate curse.
# Khasva Vei`Ras:
On engage, spawn 2x Vampire Soulseeker's in the room on each side. Every 30s each soulseeker will spawn a Vampire soul that will mark 1 client as their destination. If the soul gets within 10ft of the client, then the client is DTed and a "Deathwalker Vampire" spawns in their place.
Deathwalkers will stagger and drop at 50% and must be staked 5 times before they can be killed. If they are not staked, then they gain 15% DPS.
Every 45s Vei'Ras will place a Mark upon himself and players will have to click the crystals around the room depending on which Mark he uses. Each time a crystal is clicked out of order then spawn 2x Deathwalker Vampire. Players will have 35s to click the crystals.
Mark of Strength: Red > Green > Yellow > Blue > Purple; If Failed then increase DPS by 25%
Mark of Blood: Green > Red > Purple > Blue > Yellow; If failed then increase HP by 25% and DPS by 10
Mark of Dread: Purple > Yellow >Red > Blue > Green; if Failed then drain Client list mana by 50%
Mark of Agony: Yellow > Purple > Green > Red > Blue; If Failed then drain Client List HP by 50%
At 85, 65, 45, 25% Vei'Ras will call for assistance from his Master. This will spawn 8 adds in the hallway that will roam into the room. Players will have 2 minutes to kill all 8 adds. If any adds are still up after two minutes, then Vei'Ras will absorb their power increasing his HP by 10*Number of minions and DPS by 2*Number of Minions. Additionally if any adds die in front of Vei'Ras he will gain 10% HP and 2% DPS.