I do the dual red because they're faster kills/capture because their hp is lower on dual quests. And the fact that there's fewer TYPES of parts in the red's rewards make your chance of getting a Special Cut slightly higher.
VIbrant Combs I had the same problem with... I killed 20 of those jerks, breaking their hair every time, with a friend helping before I got the 2 I needed at the time.
Heavenly Scales have the highest chance of appearing in the rewards of EPIC quests surprisingly.
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