Hi,
I butter my pd usually about once a week, I have nearly finished my first tin of buzz butter, but luckily when I got my pd, I was sent two tins.
I guess I am lucky, as I have always blown into the bag, having read other peoples experiences, I never tried blowing into a glass, though I do find my herb does stick to the inside of the bag.
The packing method I use is pack by hand, I take a pintch or two between finger and thumb, and put it into a tube.
Once I can feel the herb near the top of the tube with my index finger, I then brush away any that is really sticking out, and then I tap the tube contents down by rapidly tapping the metal part of the tube with my index finger til it feels packed in.
I would never get any other vape than a PD, they are just so efficient, and I think I would feel disappointed by trying any other vape, as the pd sets such a high standard, though I would be curious about trying a volcano just for the experience, but I don't know any other vape owners, so I doubt I will ever get to do that.