Concerning the particulates getting into the mouthpiece, I have not experienced that yet, but then I've only had my Pax for a couple weeks so far. I wonder if it might help to put a small bit of cotton underneath the screen. I've also thought of this in terms of making the oven smaller if you want a smaller load since this thing definitely works better when the oven is full. Seems a bit of cotton might help to both filter a bit better any escaping particulates while also allowing the user to utilize less herbs for a full load. Bear in mind, I have not tried this, but I have heard others use cotton in other vapes for similar problems. Thoughts?