Het
@Espo! Maybe I can help a little. The sandwich and pusher are for those who don't like to fill the pax 2 oven. The pusher is an adjustable spacer. If you used a folded screen in your pax 1, this is a big improvement, but both methods work. That piece is also half of the sandwich. The bottom half is New Vape's screen. I've heard on FC that using both pieces doesn't leave much room for product. And I'm happy with the pax 2 stock screen (there's a 2nd generation of these with little dimple feet). That screen with proper installation works great.
I've read that the vented base was created to address complaints of some that the draw was too restrictive. There has not been much feedback here on that piece. I'm hesitant to use that piece since it wasn't engineered by Ploom. And I'm happy with how this works without it.
But I did need a spacer and got and am very happy with the pusher. I hope this helps.