Sleeping pad slip-sliding away

Try getting an anti-slip mat made to go under rugs on hardwood floors. Trim it to match your xlite, then try it out. Progressively trim more and more of it away until you’re at the minimum that holds your pad in place just well enough to suit you. No alteration of your xlite or your tent, at least until you’re sure about how much anti-slip is needed.

I have no experience with this but but maybe something like this?

www.gossamergear.com/products/thinlight-foam-pad?variant=30497164620

I use one of those under my Neoair to help prevent punctures through the floor and provide a bit of insulation in winter, but I don't know how effective it would be as a preventative for a sliding mattress. Besides, like the anti-slip mat, it's just one more thing to carry if the weather is not all that cool, which I believe helps to justify it with a double purpose.

I've tried both dots and stripes (big dots, little dots, straight stripes and "squiggly" stripes, both of varying sizes and thicknesses - I have a lot more tents than I'll ever need, and I've redone them a few times because, if used enough, the silicone will eventually (I've found) get matted with debris, and silicone will sometimes "peel" - but maybe I'm just not good enough or careful enough) and feel stripes work better, but I don't have any objective proof of that statement. Both work, but maybe one is better on steeper slopes.

I like franco's perpendicular stripes best. Also, I tend to lay back and let my creativity fly on this stuff rather than do carefully placed anything. My seam-sealing is done on the outside of my tents, and I decided, after a lot of OCD seam-sealing, that "being super careful" is for the birds. Maybe I'll even show up at Pickle Gulch this year (depending on health) and bring my "skunk", the old Tarptent Squall I seam sealed myself, but put the talcum on too soon: big white stripe down the ridgeline, but I haven't had that one out for years, so maybe it "mellowed" (or "yellowed").

I gave up long ago trying to keep what gear I have "pristine", at least as far as modifications for my own comfort go. This attitude probably varies as much as anything else from person to person. My attitude is that I'm going to "make it mine", and not even worry about "resale value" or whatever. How many debates about changes to your house have you had with your spouse? I simply don't care about how someone else feels about a house I've lived in and modified to my comforts and tastes. For me, that's silly. If I want that blue wall in the entry foyer and someone else thinks it's too dark or too garish, well, they can take a hike. Hey, I stopped long ago slavishly keeping the stakes and guylines that come with a tent, even with Tarptents, which include rather nice, lightweight stakes. I have my own "quiver" of stakes (in fact, a few different ones), and have no need to keep all that stuff together for the sake of someone else's druthers sometime down the road.

ETA(like I need more crap here!): I once bought some "industrial strength velcro" (of the androgynous type) and used it on a pack to reinforce some addition I made. There are a lot of interesting "velcro-like" products out there now.
www.andybaird.com/travels/gertie/superlock.htm
If I recall correctly, there was a discussion (long ago) about using velcro on a pyramid tarp tigger modified to add removable mesh along the bottom edge of the tarp (seems like I remember he used tulle instead of no-see-em, but I get older every minute and more forgetful) so he could switch it for a solid piece of fabric when needed.
Amazon: 3M Dual Lock Reclosable Fastener
Four to six of these on both tent floor and mat, and I suspect nothing will be moving anywhere. Plus, you could just deflate the thing and leave it in the tent! (Uh huh, gabby ... Right.) If you weren't concerned about that expensive dyneema at all, you could just glue a mattress to the floor. (Then the tent would slide along the ground - right.)

Don't be afraid to try something new! (Of course, your tent, mat (and, possibly, house) "resale value" will decline precipitously.)

I agree with the thin striping at cross-angles, but will silicone stick to DCF?

It's possible that striping on only the pad would provide enough traction against the DCF, but I don't know.

When Cuben Fiber tents were still not taped I did a few using silicone. I think ZPacks used to include a tube of Silnet, SMD has both Seam Grip and Silnet listed for possible use.
I did not like seam sealing with Sweam Grip... (Bibler and Black Diamond tents required that)