I have a PAX3 vaporizer and it came with a PAX grinder. However, I have lately seen on Youtube tips and tricks for PAX vaporizer and the guy in the review recommends a very fine grind, such as one from this grinder: https://www.newvape.com/fine-grinder-titanium-gray-2726 So, I did order an additional grinder from Amazon, called a Masterdam 2 piece grinder. All aluminum. But just this morning I got a support email from PAX and they say in best vaping to "use a medium coarse grind - think loose tea" and to pack very very tightly. What are your opinions and thoughts about the grind for most convection vaporizers? Very fine or med-coarse?