I have been using the NeoAirs as my back support/frame.... whatever you want to call it, for the last couple of years. I got tired of rolling the pad up each morning and then stuffing it in the little stuff sack... so, I just started folding it in half, then in thirds, and putting it inside my pack, against the back, and then filling the rest of the pack as normal. This makes it super easy to pack up, or unpack, each day, and while it probably still fills the same amount of space, I like to think that since it's long and flat against the back instead of in a big ball somewhere inside the pack, it also gives me a little extra room.
Anyway, I also sometimes carry a 1.8" GG TL pad, but I usually fold it inside the XLIte since things catch on it easier (things just slide against the XLite). Of course, you do have to be aware of what you are putting against the pad, but it's not that bad... so far, nothing has happened with mine.
Here is a video I did a while back that shows me unpacking my (at the time, new) Arc Blast with the pad packed this way. (Skip ahead to about 12:30 or so in the video for the pad.)
Practice packing the Arc Blast