Hi Jan,
Thank you for your feedback of John Arbon Yarnadelic yarn. We agree, Yarnadelic has some truly rich colors! We're sorry to hear that you're having problems with your sweater pilling. A number of things can factor into garment pilling, including the fiber in the yarn and the gauge that the fabric is knit at. As you aptly pointed out, softer wool yarns tend to be more susceptible to pilling. Yarnadelic being a Corriedale fiber, it may pill especially when knit at a looser gauge, but should subside over time.
If we can be of any help at all when selecting a yarn for your next project, please let us know!