Well, I've decided to give them a 30 minute cold soak. As I said, they fit just about perfect right now, but we all know how that goes with the "stretch" of everyday life. And I'd rather suffer early then potentially change my fades later.
They're super long right now too, so an inch off the total length will be a good thing.
I think getting the shrinkage out now is a good call for the reasons you mention. I don't think 30mins cold is going to do much to them though and then you're not really any further on. When it comes time to wash them properly, exposing them to warmer water over longer time will just shrink them at a later date.
You might be right but I don't intend to ever let them touch hot water, so I don't think the shrinkage will ever be a factor.
Now then, we'll see if I'm whistling a different tune when I try to squeeze into the freshly dried 25oz Kevlar tubes in the morning.