If this is a mixing issue, I'll offer this little tid bit: Once I have my bulk plastic thoroughly mixed it goes into several smaller, transparent jugs....1 pint and 1 quart. I have about ten of these filled and right on the injection bench always. I leave about 3/4" at the top when filling to allow for shake mixing just prior to using. The smaller containers allow me to see the bottom of each and if any settling has happened I can see it and its a whole lot easier to shake any pack back into the plastic using the smaller bottles. Plastic coming in white bottles, boxed bags and five gallon units really make visual confirmation of packed plastic or thorough mixing a lot of guesswork.
Kodiak....if this turns out to be a hard pack problem or not you really need to get a probe-type, fast read thermometer. Do-It sells a dandy, but it won't matter what brand you need to keep in mind that when reading a temperature you want to have the probe's end in the middle of the mass of the plastic in the cup, not with the probe's tip touching the sides or the bottom of the cup. Your ir thermometer reads only surface temps so unless you're stirring that plastic like crazy when the take an ir reading you won't be getting the center mass temp and that is always the warmest. Also keep in mind that the plastic, like foods, coming out of the microwave will continue to cook for some time if you do not stir it to get the heat fully distributed and that too can cause clouding and scorching problems.
