I talked to the guys are Bait Plastics today. My thoughts were right for a change. Could be one of two things, Mix the hardpack at the bottom of the jug more better. I'm going to try one of those pant mixers you stick in a drill. And he also told me to make sure I heat the stuff hot enough. I tried to be really careful as this stuff seems to be super fragile with heat.
I did get a number of re-heats with the stuff before it started to yellow a bit. So I added it to some darker colored leftover stuff.