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It is possible that the bouncy color version of Tachyon is inconsistent (in stretch) because of a "tuning" problem at the mill when they were setting up for that run of rope. You might want to contact NE Ropes to discuss. Seriously doubt that pigment is going to cause a major difference in rope stretch for a given construction/brand.
-AJ
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I would have to agree, placebo is a crazy phenomenon and just having something be a different color may be skewing the perception. But it could very well be a change during use, different hitch cords, different wear patterns, maybe the rope being damp. I would assume that pigment would change it in some way but I doubt we would be able to perceive a difference with our hands/eyes.
As AJ said it may just be a tuning problem in the machine, they do not have just one machine set up for 1 rope so it may just be that when they set up the machine for this batch they were off. But I would hope they do a spot check / batch test before it leaves NE ropes...
I would like to see a UN colored rope, not bleached, not dyed just an ugly off white rope... and compare it with a super dyed climbing line...that would be fun.