IMO you're sticking it in the freezer too soon. Let it chill for 48 hours on that glass... stick an electric blanket underneath it as well, will keep it warm and keep your moisture evaporating... it's crackling cause there's moisture in it... I can't think of the term right now but freezers use a misty kind of freezing method or whatever... ya know how there's usually frothy mist swirling around when you open the freezer, and you get frost/condensation on things that are in there a long time... so if you oil isn't COMPLETELY sealed before you put it in the freezer you're going to add moisture to it.

If your seal-a-meal has an accessory hole + tube + container that you can use, you can kinda purge in that... pretty hard to purge in a bag... in the end though it's really not enough pressure to completely purge it.

The type of butane you use matters a lot, particularly if you're NOT purging... so step up to Newport or Colibri or something...

letting it sit on glass on top of an electric blanket for 48 hours is my biggest advice though

good luck


EDIT: Yeah... I just read you're using Power 5x... if you're not purging, you're not gonna get quality oil with that butane IMO