By coincidence, I have made a lot of pop up cards with the 105lb Neenah Stardream metallic cover stock. I have been using the 111lb Mohawk Curious Metallics more frequently lately but, they are very similar.
Most recently, I was scoring with 500/22 in one pass.
Scorching is rarely noticeable with the colors I use. One solution, if you are having trouble with that, is to mask the stock with Frisket film. That’s a low-tack masking that will peel right back off of the paper without damaging the surface. I have used that to get a pristine “ice silver” version of this card. It’s not inexpensive but, might be worthwhile for some projects.
Another thing to consider is whether the Glowforge is the optimal tool. For some pieces, I score at least one side by hand with the back side of a craft knife. For complicated designs, I use very thin acrylic to make a scoring stencil (on the Glowforge). Here’s a link directly to the timecode in one of my videos where I score like that.
If you are not worried about a little discoloration, you could also use a very low power to lightly mark the score lines, then score them by hand.
I am using a Seklema mat most of the time to hold my stock down in the laser. If there aren’t going to be a lot of loose flying bits, I sometimes just hold the stock down with magnets. That’s generally not recommended because it can cause unexpected print failures by interfering with the air assist fan. A DIY vacuum table would likely be great, too. As long as the stock stays flat during cutting, it should be fine.
Elmer’s or other PVA glue is a solid choice. I have been using a rub-on transfer dry adhesive for many paper projects requiring glue lately. Here is another recent video showing dry transfer adhesive works.
I hope some of that helps! I look forward to seeing what else you do!