if you use more then like 25% glycerine you may have issues with the hash oil separating out. Not really an issue if you shake before you use. But i would mane an alcohol infusion first then add the glycerine.
that paper is good if you have a very pure extract and some really good equipment. Those times and temps are somewhat correct, but baking in the oven at 250 is not the same as the chart at 250.