I follow Per's recommendation as far as flakes.I was down a YouTube rabbit hole one night and came upon a video that Smokingpipes did when they visited Per Jensen at Mac Baren. He spoke about the time and effort to create flakes and coins. He spoke about how the burning properties were better and you got more flavor and he didn’t understand rubbing out (I’m paraphrasing). Ever since, if it’s flake, it’s folded and stuffed. As Hoosier states above, the art is knowing your bowl’s capacity.
Jason
I'll grab a bout two flakes. cut them across so that they fill the chamber 3/4 full when folded, rub some out and press it down on top of the flakes. The diameter of the folded flake should be a little over 3/4 the diameter of the chamber so it can expand without block the chamber.