I do popcorn at 30% power until the first pop and then switch to full power until the popping is really slow; it really cuts down on unpopped kernels.
You can do 50% power, but I feel that the slower 30% power really helps to get every kernel up to a nice baseline before you go full power.
No dice roll is random because the outcome of the roll has been determined before it was rolled. You were always going to roll it that same way except in an alternative reality where you rolled in every conceivable way, which you do not live in because you are in this reality and you rolled in the observed way.