Glad the screen is working for you, Mike...
The Pax2 that I have, since I bought it when it first came out, has the screen without the feet. I never saw the need to buy another one yet... Personally I think it may not make a difference in anything other than maybe how much cleaning there is to do (anybody have an opinion on this?).
The dimpled screen (feet) is only going to affect airflow if the screen is placed too low, so that the feet touch the floor of the oven and give some space for air/vapor. I know you all know the right way to place the screen, so it shouldn't make any difference for the ones with the smooth screen since they wouldn't touch the bottom anyway.
Bought from a local shop, box was open but everything looked brand new. Two units were ooen, one with the raised mouth piece and one with the flat. I grabbed the one with the raised, the silver. Got home and noticed the piece inside the box was also raised.
You should've received both a flat and raised mouthpiece! Every PAX 2 purchased from an authorized source has one of each. If you don't see a flat one anywhere, PM me and I'll send you a pack.