Have you always dyed at those temperatures? I used to dye parts at about 140 but found that when trying to remove the dye with bleach (for multi-colored dye jobs) that it didn't remove all of it. It seemed that the parts were sometimes prematurely sealing when the dye temperature was 140 and above. I've since gone to 'cold' dyeing, where my dye is at 70-110 degrees, but not warmer. The colder dyes will absorb slower, but they seem to reach the same end color as the 140 degree dyes.
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