Mad King Laurent Drop rates/Drops

This is a boss that takes (for me) around 15 minutes to kill, I've killed it 5 times now and the rewards are very unmotivating.
I think changes to the number of drops or the drrops themselves should change, from what I remember this dropped:
Boss 1: 13x Manastone Fastener
Boss 2: 1x Transformation Contract
Boss 3: Couple of Gold Cubics (Not sure)
And to me that is really not worrth 15 minutes of my time, and let's say we do it 3 people, that means we could kill it in 5 minutes, but is 5 minutes worth 4x Manastone Fastener each? I think not.
Idea:
300x Manastone fastener
Ultimate Cloud War Gear parts
Ancient Transformation Contracts
Legendary Transformation Contracts
Legendary & Ultimate Manastones
Mounts
Thunder, Water & Fire Dragon King Weapons
& Other fun stuff people would be excited to get

 

Compared to how it was before, it takes much longer to kill it now. We have not yet updated the drops, but will do so soon, thank you for your suggestions.