No actual answers - just more personal speculation & observations ~
I'd have to concur - the wrap seemed very inconsistent - inkonsistant - enconsidant? - Yeah, kinda like that :p
Back in '07 I searched the web all year collecting pics to figure out my Gold Strata. (resolved here on VDF) Cool1
The primary problems, along with wrap batch variations, I think, range from people misnaming them, to difficulty photographing them, to fading.
It almost seems that the older the drum, the more two-tone the colors are, with the Gold being the only real 3-tone. Over time, they all seem to be 3-tone variations - black, silvery and the base color (name)
One thing, about your "where they cut the wrap" idea ~ this link to Delmar has a cool pick of the giant block of material being shaved for wrap. I don't know if this is the same process as in Strata days, but your blend consistency idea could easily be imagined with such a process - especially with those wacky Stratas.
http://www.delmarproducts.com/OurProducts.htm
Maybe it also depended on which side of the block the wrap was cut from in relation to how the strata colors were poured "Whoops! We had that block upside-down and backwards" Laughing H