I know I'm bumping a very old and vast thread, . . . And it seems this is a PAX review thread, but it also contains some tips and tricks to the screen issue.
So, in that is my review and why I'm here. I am a fan of this device. Although, the screen issue is a horrible design flaw. I struggled with this device, cleaning it meticulously - trying to find the "perfect screens", as the PAX rep. suggested. It just would rarely ever hit efficiently and with the screen sitting properly in the chamber. To make it even more confusing, the PAX website says only to clean the edges, use a pen cap to create that curved tension while placing the screen and not to BEND the screen. Wait, what? But it has to flex in the oven to hit optimally?
Here's my solution; I clean the screens and oven to get rid of the residue. I believe it makes the loads harsh if it builds up. I DON'T remove the residue from just the tiny spot where the indent is meant to catch the screen.
The second part of this involved taking a 100g mass and using it to straighten, and then give the screen it's perfect bend. Just by pressing the screen to the curve of the mass, I was able to work with the screen. I had a few other weights, but the 100g one just looked like it wouldn't bend it too much or too little. This is a "goldie-locks" type device when it comes to these screens.
I think PAX should just do this from the get go. If it's meant to be curved in the oven, then don't machine it to be straight. The "flex" variable of their screens has sent many toasty-hot materials all over my hand while stirring. I'd think for that reason the PAX 2 is designed differently. And also for that reason, I think they should upgrade PAX 1 owners to their non-flawed model.
Anyway, this has worked for multiple screens. Every load since hits hard, toasts thoroughly. The screen easily snaps back into place after cleaning. My screens are staying in there firm now, as well. A fuzzy stick from the mouth piece side is the sure bet to get it out. I'll also add that the smaller amount of residue you leave on the indent, the easier it is to lift the screen with a safety pin or whatnot from the oven top.
TL;DR? Maybe the internet isn't for you, . . .
Hope this helps and is on point.