My only beef with the whole thing is: from the same manufacturer, there shouldn't be any difference in stiffness between two colors (or lack thereof) in the fiberglass. I never had that problem with what built using glass made by Gordon's. It has happened twice actually, the first one I thought maybe my caliper was off a bit when making the cores, but it wasn't, I check, I had the stack right where it needed to be. But the sad part with the first time; was the guy sent me some veneers he had, to use on the bow he wanted me to build, and it came out light. I had to shorten it some to get his draw weight. He told me no problem, but I could tell he wasn't all that happy about it. I wasn't, I know that much.
In the future, I think I'll use the bb glass if I'm making something that doesn't need to be at a draw weight somebody ordered. I got too much going on to have to make additional calculations. It is more clear, but most of the guys I deal with would rather have the draw weight right, and the length right.